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A107874
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Column 0 of triangle A107873; a(n) = C( n*(n-1)/2 + n+3, n).
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2
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1, 4, 15, 84, 715, 8568, 134596, 2629575, 61523748, 1677106640, 52179482355, 1823810410032, 70724320184700, 3012192716517082, 139737927523546800, 7012067478708989884, 378371310857796292200, 21843987843214746108900
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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Table[Binomial[(n(n-1))/2+n+3, n], {n, 0, 20}] (* Harvey P. Dale, Oct 05 2019 *)
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PROG
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(PARI) a(n)=binomial(n*(n-1)/2+n+3, n)
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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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