a(n) = [n/2]!*[(n+1)/2]!*C([n/2],1)*C([(n+1)/2],1).
A226282
a(n) = [n/2]!*[(n+1)/2]!*C([n/2],1)*C([(n+1)/2],1).
Terms
- a(0) =0a(1) =1a(2) =4a(3) =16a(4) =72a(5) =324a(6) =1728a(7) =9216a(8) =57600a(9) =360000a(10) =2592000a(11) =18662400a(12) =152409600a(13) =1244678400a(14) =11379916800a(15) =104044953600
External references
- oeis: A226282