a(n) = (n^2-1)*n!/3.
A090672
a(n) = (n^2-1)*n!/3.
Terms
- a(0) =0a(1) =2a(2) =16a(3) =120a(4) =960a(5) =8400a(6) =80640a(7) =846720a(8) =9676800a(9) =119750400a(10) =1596672000a(11) =22832409600a(12) =348713164800
External references
- oeis: A090672
A090672
a(n) = (n^2-1)*n!/3.