a(n) = exp(1) * Sum_{k>=0} (-1)^k*(n*k + 1)^n/k!.
A307080
a(n) = exp(1) * Sum_{k>=0} (-1)^k*(n*k + 1)^n/k!.
Terms
- a(0) =1a(1) =0a(2) =-3a(3) =19a(4) =497a(5) =-1899a(6) =-489491a(7) =-15433676a(8) =618450881a(9) =120846851155
External references
- oeis: A307080