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A118352 Semi-diagonal (one row below central terms) of pendular triangle A118350 and equal to the self-convolution of the central terms (A118351). 4
1, 2, 13, 96, 770, 6530, 57612, 523446, 4864795, 46032288, 441981816, 4295393886, 42172388820, 417668676206, 4167719552099, 41861139949200, 422890327921650, 4294027462637528, 43801007565527184, 448625344231794792 (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)^2, n)}

CROSSREFS

Cf. A118350, A118351, A118353, A118354.

Sequence in context: A140636 A282724 A104255 * A320360 A074614 A184019

Adjacent sequences:  A118349 A118350 A118351 * A118353 A118354 A118355

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 26 2006

STATUS

approved

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Last modified March 26 05:43 EDT 2019. Contains 321481 sequences. (Running on oeis4.)