A167550 The a(n,n+1) diagonal of the ED1 array A167546

1, 7, 62, 762, 12264, 245640, 5897520, 165145680, 5284782720, 190253266560, 7610141548800, 334846347897600, 16072626136089600, 835776577757721600, 46803488615967283200, 2808209320881060096000, 179725396599156215808000

Offset

1,2

Links

Table of n, a(n) for n=1..17.

Formula

a(n,n+1) = 4*(n-1)*a(n-1,n)+3*(n-1)! with a(1,2) = 1.

Crossrefs

Equals the a(n, n+1) diagonal of the ED1 array A167546.

Sequence in context: A060005 A055066 A216534 * A304895 A161201 A007291

Adjacent sequences: A167547 A167548 A167549 * A167551 A167552 A167553

Keyword

easy,nonn

Author

Johannes W. Meijer, Nov 10 2009

Status

approved