a(0) = 1; a(n) = 3 * n * a(n-1) + Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
A343686
a(0) = 1; a(n) = 3 * n * a(n-1) + Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
Terms
- a(0) =1a(1) =4a(2) =33a(3) =410a(4) =6796a(5) =140824a(6) =3501782a(7) =101589732a(8) =3368237928a(9) =125634319104
External references
- oeis: A343686