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A037963
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(n+5)!*n^2*(n+1)*(3*n^2+7*n-2)/11520.
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1
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0, 1, 126, 5796, 186480, 5103000, 129230640, 3162075840, 76592355840, 1863435974400, 45950224320000, 1155068769254400, 29708792431718400, 783699448602470400, 21234672840116736000, 591499300737945600000
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OFFSET
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0,3
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COMMENTS
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For n>=1, a(n) is equal to the number of surjections from {1,2,...,n+5} onto {1,2,...,n}. - Aleksandar M. Janjic and Milan Janjic, Feb 24 2007
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REFERENCES
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The right-hand side of a binomial coefficient identity in H. W. Gould, Combinatorial Identities, Morgantown, 1972.
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LINKS
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Table of n, a(n) for n=0..15.
Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
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CROSSREFS
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Sequence in context: A292882 A140902 A270512 * A240929 A285172 A208618
Adjacent sequences: A037960 A037961 A037962 * A037964 A037965 A037966
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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