A135474 A071605(n)/(n-1)!.

1, 3, 9, 36, 285, 1908, 21630, 197328, 2113911, 23814810, 294557142, 3893052636, 55457566905

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Crossrefs

Cf. A071605, A040175.

Sequence in context: A038079 A163144 A128094 * A279121 A076964 A034808

Adjacent sequences: A135471 A135472 A135473 * A135475 A135476 A135477

Keyword

nonn,more,hard

Author

N. J. A. Sloane, Feb 08 2008

Extensions

a(10)-a(13) from Stephen A. Silver, Feb 21 2013

Status

approved