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A056616
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Numerator of binomial(2n,n)/(2n+1).
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2
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1, 2, 6, 20, 70, 252, 924, 1144, 12870, 48620, 184756, 705432, 2704156, 10400600, 40116600, 155117520, 200360130, 466721244, 9075135300, 11781754600, 137846528820, 538257874440, 140273264248, 8233430727600, 32247603683100
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| It is easy to type binomial(2n,n)/(2n+1) by mistake, when one really wants the Catalan numbers binomial(2n,n)/(n+1), A000108.
Differs from A000984 at positions in A101681.
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EXAMPLE
| 1, 2/3, 6/5, 20/7, 70/9, 252/11, 924/13, 1144/5, 12870/17, ...
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CROSSREFS
| Cf. A056617, A000108.
Sequence in context: A065345 A130914 A087944 * A065346 A071976 A000984
Adjacent sequences: A056613 A056614 A056615 * A056617 A056618 A056619
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KEYWORD
| nonn,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 28 2000
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