A181030 Duplicate of A006506.

1, 2, 7, 63, 1234, 55447, 5598861, 1280128950, 660647962955, 770548397261707, 2030049051145980050, 12083401651433651945979, 162481813349792588536582997, 4935961285224791538367780371090, 338752110195939290445247645371206783

Offset: 1

Author

Keywords

• dead

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21

Crossrefs

Diagonal of A181031.

Formula

Conjecture: a(n) = A006506(n-1), n>1. - R. J. Mathar, Oct 02 2010