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A071755 Expansion of (1+x^4*C^4)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108. 0
1, 2, 5, 14, 43, 138, 456, 1540, 5291, 18434, 64974, 231268, 830110, 3001316, 10920630, 39959280, 146943435, 542771250, 2012905950, 7492104180, 27977841930, 104792420460, 393587773800, 1482017530968, 5593455054558 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
CoefficientList[Series[(1+x^4((1-Sqrt[1-4x])/(2x))^4)((1-Sqrt[1-4x])/ (2x))^2, {x, 0, 25}], x] (* Harvey P. Dale, Jul 26 2011 *)
CROSSREFS
Sequence in context: A071747 A071751 A052301 * A149879 A366025 A366042
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 06 2002
STATUS
approved

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Last modified February 24 11:15 EST 2024. Contains 370303 sequences. (Running on oeis4.)