a(n) = exp(-1) * Sum_{k>=0} (k*(k - n))^n / k!.
A340823
a(n) = exp(-1) * Sum_{k>=0} (k*(k - n))^n / k!.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =124a(5) =-2075a(6) =91993a(7) =-4709903a(8) =312334595a(9) =-25531783799
External references
- oeis: A340823