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A182025
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a(n) = 31*binomial(2*n,n-4) + Sum_{i=1..n-4} binomial(2*n,n-4-i)*(4+i).
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1
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0, 0, 0, 0, 31, 315, 2112, 11830, 60060, 287028, 1317840, 5883768, 25741485, 110921525, 472431960, 1993896450, 8354335080, 34799391000, 144259293600, 595644532560, 2451231964350, 10059146122662, 41181227878560, 168246990214380, 686162857445736, 2794089011606200, 11362424624634720, 46152024284293200, 187266363241782825
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OFFSET
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0,5
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LINKS
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FORMULA
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Conjecture: 558*(n-4)*(n+4)*a(n) +7*(-631*n^2+777*n+4600)*a(n-1) +4370*(n-1)*(2*n-3)*a(n-2)=0. - R. J. Mathar, Aug 08 2012
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MAPLE
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f:=n->31*binomial(2*n, n-4)+add(binomial(2*n, n-4-i)*(4+i), i=1..n-4);
[seq(f(n), n=0..40)];
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MATHEMATICA
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Table[31*Binomial[2n, n-4]+Sum[Binomial[2n, n-4-i](4+i), {i, n-4}], {n, 0, 30}] (* Harvey P. Dale, May 24 2016 *)
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PROG
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(PARI) a(n) = 31*binomial(2*n, n-4) + sum(i=1, n-4, binomial(2*n, n-4-i)*(4+i)); \\ Michel Marcus, Apr 05 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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