A293906 E.g.f.: exp(Sum_{n>=1} A000009(n-1)*x^n/n).

1, 1, 2, 6, 30, 174, 1284, 11148, 110604, 1215180, 15066936, 205333416, 3031876872, 48536481096, 834192650160, 15357616617744, 301627633467024, 6274718094035088, 137885714638938144, 3199063553591292000, 77943291010448903136, 1991687512094232297696

Offset: 0

Author

Seiichi Manyama, Oct 19 2017

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..439

Crossrefs

Cf. A000009, A293528.

Formula

a(0) = 1 and a(n) = (n-1)! * Sum_{k=1..n} A000009(k-1)*a(n-k)/(n-k)! for n > 0.