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Search: id:A033434
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| 1, 4, 13, 43, 145, 497, 1727, 6071, 21554, 77180, 278426, 1010990, 3692213, 13553555, 49981875, 185082495, 687923790, 2565602160, 9598056630, 36008860650, 135446603370, 510706730274
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OFFSET
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0,2
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FORMULA
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a(n)=( 27*n^3 + 81*n^2 + 108*n + 24)*binomial(2*n, n)/(n+1)/(n+2)/(n+3)/(n+4) - Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 11 2004
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PROGRAM
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(PARI) a(n)=( 27*n^3 + 81*n^2 + 108*n + 24)*binomial(2*n, n)/(n+1)/(n+2)/(n+3)/(n+4)
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CROSSREFS
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Sequence in context: A072307 A121486 A003688 this_sequence A113986 A149426 A042767
Adjacent sequences: A033431 A033432 A033433 this_sequence A033435 A033436 A033437
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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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