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A106440
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a(n) = binomial(2n+4,n)*binomial(n+4,4).
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1
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1, 30, 420, 4200, 34650, 252252, 1681680, 10501920, 62355150, 355655300, 1963217256, 10546208400, 55367594100, 285028443000, 1442592936000, 7193730107520, 35406640372950, 172255143129300, 829376615067000
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1+12x+6x^2)/(1-4x)^(9/2).
D-finite with recurrence n^2*a(n) -2*(n+2)*(2*n+3)*a(n-1)=0. - R. J. Mathar, Feb 20 2015
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MATHEMATICA
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Table[Binomial[2n+4, n]Binomial[n+4, 4], {n, 0, 20}] (* Harvey P. Dale, May 03 2019 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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