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A167550 The a(n,n+1) diagonal of the ED1 array A167546 1
1, 7, 62, 762, 12264, 245640, 5897520, 165145680, 5284782720, 190253266560, 7610141548800, 334846347897600, 16072626136089600, 835776577757721600, 46803488615967283200, 2808209320881060096000, 179725396599156215808000 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)