The formula to generate the Fibonacci sequence is quite simple. You start with two initial numbers, which are usually 0 and 1, and then add the two previous numbers in the sequence to get the next number. So, the formula for the Fibonacci sequence is:
F(n) = F(n-1) + F(n-2)
Where F(n) represents the nth number in the sequence, and F(n-1) and F(n-2) represent the two previous numbers.