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A133158 Binomial transform of A126568, second binomial transform of A026641 . 3
1, 3, 12, 57, 294, 1578, 8658, 48177, 270774, 1533450, 8736432, 50016090, 287497380, 1658174352, 9591422286, 55618701057, 323225066790, 1882009941570, 10976834700792, 64119701075886, 375057555388884, 2196539772794172, 12878508015774468 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The Hankel transform of this sequence is 3^n (see A000244) .

LINKS

Table of n, a(n) for n=0..22.

FORMULA

Conjecture: 2*n*a(n) +(-19*n+12)*a(n-1) +6*(8*n-11)*a(n-2) +36*(-n+2)*a(n-3)=0. - R. J. Mathar, Jun 30 2013

CROSSREFS

Row sums of triangle in A124575 .

Sequence in context: A110309 A101106 A165310 * A194089 A178807 A047891

Adjacent sequences:  A133155 A133156 A133157 * A133159 A133160 A133161

KEYWORD

nonn

AUTHOR

Philippe Deléham, Oct 08 2007

STATUS

approved

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Last modified November 22 08:48 EST 2014. Contains 249805 sequences.