a(n) = [n/2]!*[(n+1)/2]!*C([n/2],3)*C([(n+1)/2],3).
A226284
a(n) = [n/2]!*[(n+1)/2]!*C([n/2],3)*C([(n+1)/2],3).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =36a(6) =576a(7) =9216a(8) =115200a(9) =1440000a(10) =17280000a(11) =207360000a(12) =2540160000a(13) =31116960000a(14) =398297088000
External references
- oeis: A226284