(3/4)*(27*n^2-137*n+180)*n^(n-6)*(2*n-6)!/(n-3)!.
A104003
(3/4)*(27*n^2-137*n+180)*n^(n-6)*(2*n-6)!/(n-3)!.
Terms
- a(0) =6a(1) =306a(2) =29700a(3) =4798080a(4) =1178634240a(5) =412483246560
External references
- oeis: A104003
A104003
(3/4)*(27*n^2-137*n+180)*n^(n-6)*(2*n-6)!/(n-3)!.