a(n) = [n/2]!*[(n+1)/2]!*C([n/2],4)*C([(n+1)/2],4).
A226285
a(n) = [n/2]!*[(n+1)/2]!*C([n/2],4)*C([(n+1)/2],4).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =576a(8) =14400a(9) =360000a(10) =6480000a(11) =116640000a(12) =1905120000a(13) =31116960000a(14) =497871360000
External references
- oeis: A226285