a(n) = Sum_{k=0..n} binomial(n, k + 1)*k!*(n + 1)!/(k + 2)!.
A355171
a(n) = Sum_{k=0..n} binomial(n, k + 1)*k!*(n + 1)!/(k + 2)!.
Terms
- a(0) =0a(1) =1a(2) =7a(3) =50a(4) =406a(5) =3804a(6) =41028a(7) =506064a(8) =7084656a(9) =111690720a(10) =1967421600a(11) =38425449600a(12) =825970435200
External references
- oeis: A355171