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Search: id:A037960
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| 0, 1, 14, 150, 1560, 16800, 191520, 2328480, 30240000, 419126400, 6187104000, 97037740800, 1612798387200, 28332944640000, 524813313024000, 10226013557760000, 209144207720448000, 4480594531725312000
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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+2} 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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Cf. A019538.
Sequence in context: A019521 A009614 A009802 this_sequence A016163 A016215 A097227
Adjacent sequences: A037957 A037958 A037959 this_sequence A037961 A037962 A037963
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KEYWORD
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nonn
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AUTHOR
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njas
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