a(0) = 1; a(n) = Sum_{k=0..n-1} binomial(n,k)^2 * (n-k-1)! * a(k).
A336243
a(0) = 1; a(n) = Sum_{k=0..n-1} binomial(n,k)^2 * (n-k-1)! * a(k).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =56a(4) =1114a(5) =34624a(6) =1549648a(7) =94402356a(8) =7511324448a(9) =756406501200
External references
- oeis: A336243