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A132474 Column 2 of triangle A132471. 2
1, 3, 6, 54, 780, 16500, 465240, 16486512, 708621480, 36072738648, 2137167558432, 145394086979328, 11236518532643184, 977782595316947472, 95086323023335926048, 10266902547496839586848, 1223846872961573356310112 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Diagonal m of triangle T=A132471 equals diagonal m-1 of matrix power T^m for m>1: T(n,k) = [T^(n-k)](n-1,k) for n>=k>0, with T(n,n)=1 and T(n+1,n)=n+1 for n>=0.

LINKS

Table of n, a(n) for n=0..16.

CROSSREFS

Cf. A132471 (triangle); other columns: A132472, A132473.

Sequence in context: A012275 A067608 A023177 * A032070 A066569 A051641

Adjacent sequences:  A132471 A132472 A132473 * A132475 A132476 A132477

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Aug 22 2007

STATUS

approved

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)