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A118353 Semi-diagonal (two rows below central terms) of pendular triangle A118350 and equal to the self-convolution cube of the central terms (A118351). 4
1, 3, 21, 163, 1353, 11760, 105681, 973953, 9154821, 87428388, 845894700, 8273978100, 81682757317, 812829371205, 8144563709391, 82104333340467, 832125695906313, 8473862660311392, 86661931504395228, 889705959333345756 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

PROG

(PARI) {a(n)=polcoeff((serreverse(x*(1-3*x+sqrt((1-3*x)*(1-7*x)+x*O(x^n)))/2/(1-3*x))/x)^3, n)}

CROSSREFS

Cf. A118350, A118351, A118352, A118354.

Sequence in context: A166696 A058194 A179815 * A262977 A214391 A046637

Adjacent sequences:  A118350 A118351 A118352 * A118354 A118355 A118356

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 26 2006

STATUS

approved

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)