Difference between the double factorial of the n-th nonnegative odd number and the double factorial of the n-th nonnegative even number.

A122649

Difference between the double factorial of the n-th nonnegative odd number and the double factorial of the n-th nonnegative even number.

Terms

    a(0) =0a(1) =1a(2) =7a(3) =57a(4) =561a(5) =6555a(6) =89055a(7) =1381905a(8) =24137505a(9) =468934515a(10) =10033419375a(11) =234484536825

External references