a(n) = [x^n] Sum_{k>=0} x^k/Product_{j=1..k} (1 - n*j*x).

A301419

a(n) = [x^n] Sum_{k>=0} x^k/Product_{j=1..k} (1 - n*j*x).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =19a(4) =201a(5) =3176a(6) =69823a(7) =2026249a(8) =74565473a(9) =3376695763a(10) =183991725451

External references