Add permutation cycle count for (n, n-2, ..., n-3, n-1)

Signed-off-by: Ramasamy Chandramouli <rchandramouli@live.com>
Add sequences not represented as certain forms

For example, numbers not represented as abc+bcd+cde+dea+eab where
1>=a>=b>=c>=d>=e and a,b,c,d,e are integers.

Signed-off-by: Ramasamy Chandramouli <rchandramouli@live.com>