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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
OFFSET
0,2
CROSSREFS
Sequence in context: A122392 A139782 A047086 * A360272 A376574 A268648
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 06 2002
STATUS
approved