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Search: id:A036910
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| A036910 |
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(binomial(4*n,2*n)+binomial(2*n,n)^2)/2. |
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+0
3
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| 1, 5, 53, 662, 8885, 124130, 1778966, 25947612, 383358645, 5719519850, 85990654178, 1300866635172, 19780031677718, 302045506654052, 4629016098160220, 71163013287905912, 1096960888092571317, 16949379732631632570, 262435310495071434602
(list; graph; listen)
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OFFSET
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0,2
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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 3.68 page 30.
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FORMULA
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a(n)=sum{k=0..n, (binomial(2n, k))^2 } - Paul Barry (pbarry(AT)wit.ie), May 15 2003
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CROSSREFS
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Sequence in context: A069592 A065534 A123788 this_sequence A036916 A118583 A090360
Adjacent sequences: A036907 A036908 A036909 this_sequence A036911 A036912 A036913
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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