a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k)^2 * k!).
A346409
a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k)^2 * k!).
Terms
- a(0) =0a(1) =1a(2) =-3a(3) =13a(4) =-52a(5) =476a(6) =1344a(7) =156192a(8) =6935424a(9) =470168064a(10) =38948065920
External references
- oeis: A346409