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A071752 Expansion of (1+x^4*C^3)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108. 0
1, 3, 9, 28, 91, 303, 1028, 3542, 12363, 43628, 155414, 558144, 2018750, 7347281, 26888610, 98888730, 365292555, 1354757040, 5042499990, 18830130360, 70527871530, 264886906830, 997372693824, 3764155637772, 14236915323806 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

c = (1 - (1 - 4*x)^(1/2))/(2*x); (1 + x^4*c^3)*c^3 + O[x]^25 // CoefficientList[#, x]& (* Jean-Fran├žois Alcover, Sep 27 2017 *)

CROSSREFS

Sequence in context: A047047 A071744 A071748 * A071756 A176673 A215007

Adjacent sequences:  A071749 A071750 A071751 * A071753 A071754 A071755

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 06 2002

STATUS

approved

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Last modified July 10 16:22 EDT 2020. Contains 335577 sequences. (Running on oeis4.)