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A071731 Expansion of (1+x^3*C^2)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108. 0
1, 2, 5, 15, 46, 146, 477, 1595, 5434, 18798, 65858, 233206, 833340, 3001316, 10883485, 39703635, 145612770, 536568150, 1985612310, 7376106210, 27495861060, 102820589820, 385609643250, 1449998633694, 5465731321476 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..24.

CROSSREFS

Sequence in context: A287582 A122392 A139782 * A268648 A148360 A148361

Adjacent sequences:  A071728 A071729 A071730 * A071732 A071733 A071734

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 06 2002

STATUS

approved

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Last modified July 9 14:04 EDT 2020. Contains 335543 sequences. (Running on oeis4.)