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.

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

Offset

0,2

Links

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

Crossrefs

Sequence in context: A122392 A139782 A047086 * A360272 A268648 A148360

Adjacent sequences: A071728 A071729 A071730 * A071732 A071733 A071734

Keyword

nonn

Author

N. J. A. Sloane, Jun 06 2002

Status

approved