a(n) = n*(n - 1)*(27*n^2 - 67*n + 74)*n!/24.
A138783
a(n) = n*(n - 1)*(27*n^2 - 67*n + 74)*n!/24.
Terms
- a(0) =0a(1) =8a(2) =174a(3) =2856a(4) =41400a(5) =579600a(6) =8184960a(7) =119105280a(8) =1804965120a(9) =28631232000a(10) =476407008000
External references
- oeis: A138783