user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    $0xfffffff6,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0xfffffff6,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  cmp    $0x1,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  cmp    $0x1,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x2,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  cmp    $0x2,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x2,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  cmp    $0x2,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x3,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  cmp    $0x5,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x3,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  cmp    $0x5,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x4,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  cmp    $0xe,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x4,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  cmp    $0xe,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x5,%edi
  call   <find_num_possible_binary_search_trees_size_n_v1@plt>
  cmp    $0x2a,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x5,%edi
  call   <find_num_possible_binary_search_trees_size_n_v2@plt>
  cmp    $0x2a,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%eax
  pop    %rbp
  ret
```

assistant: ```c
int main() {
  assert(0 == find_num_possible_binary_search_trees_size_n_v1(-10));
  assert(0 == find_num_possible_binary_search_trees_size_n_v2(-10));
  assert(0 == find_num_possible_binary_search_trees_size_n_v1(0));
  assert(0 == find_num_possible_binary_search_trees_size_n_v2(0));
  assert(1 == find_num_possible_binary_search_trees_size_n_v1(1));
  assert(1 == find_num_possible_binary_search_trees_size_n_v2(1));
  assert(2 == find_num_possible_binary_search_trees_size_n_v1(2));
  assert(2 == find_num_possible_binary_search_trees_size_n_v2(2));
  assert(5 == find_num_possible_binary_search_trees_size_n_v1(3));
  assert(5 == find_num_possible_binary_search_trees_size_n_v2(3));
  assert(14 == find_num_possible_binary_search_trees_size_n_v1(4));
  assert(14 == find_num_possible_binary_search_trees_size_n_v2(4));
  assert(42 == find_num_possible_binary_search_trees_size_n_v1(5));
  assert(42 == find_num_possible_binary_search_trees_size_n_v2(5));
  return (0);
}
```