a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k) * k!)^2.
A346411
a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k) * k!)^2.
Terms
- a(0) =0a(1) =1a(2) =-3a(3) =4a(4) =-8a(5) =1a(6) =353a(7) =27224a(8) =1871840a(9) =147012849a(10) =13684928021
External references
- oeis: A346411