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Search: id:A037961
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| 0, 1, 30, 540, 8400, 126000, 1905120, 29635200, 479001600, 8083152000, 142702560000, 2637143308800, 50999300352000, 1031319184896000, 21785854970880000, 480178027929600000, 11029155770400768000
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OFFSET
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0,3
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COMMENT
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For n>=1, a(n) is equal to the number of surjections from {1,2,...,n+3} onto {1,2,...,n}. - Aleksandar M. Janjic and Milan R. Janjic (agnus(AT)blic.net), 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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Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
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CROSSREFS
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Sequence in context: A050982 A004327 A139626 this_sequence A075510 A028200 A028181
Adjacent sequences: A037958 A037959 A037960 this_sequence A037962 A037963 A037964
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KEYWORD
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nonn
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AUTHOR
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njas
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