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A036911
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(C(4*n,2*n)+(-1)^n*C(2*n,n)^2)/2.
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0
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1, 1, 53, 262, 8885, 60626, 1778966, 14168988, 383358645, 3355615450, 85990654178, 803232328548, 19780031677718, 193873026294052, 4629016098160220, 47101568276955512, 1096960888092571317, 11503661742608944170, 262435310495071434602
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OFFSET
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0,3
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REFERENCES
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The right-hand side of a binomial coefficient identity in H. W. Gould, Combinatorial Identities, Morgantown, 1972; Eq 3.71 page 30.
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LINKS
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Table of n, a(n) for n=0..18.
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MATHEMATICA
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Table[(Binomial[4n, 2n]+(-1)^n Binomial[2n, n]^2)/2, {n, 0, 20}] (* Harvey P. Dale, May 22 2013 *)
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CROSSREFS
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Sequence in context: A142357 A142061 A107150 * A140851 A211146 A155700
Adjacent sequences: A036908 A036909 A036910 * A036912 A036913 A036914
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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