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Search: id:A133369
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| A133369 |
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Number of surjections from an n-element set to a ten-element set. |
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+0 1
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OFFSET
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10,1
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FORMULA
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a(n)=sum((-1)^(10-k)*C(10,k)*k^n) with n>=10 and k=10,9,...,1.
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CROSSREFS
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Cf. A000918, A000919, A000920, A001117, A001118, A135456.
Sequence in context: A011521 A061603 A133132 this_sequence A071552 A053501 A090074
Adjacent sequences: A133366 A133367 A133368 this_sequence A133370 A133371 A133372
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KEYWORD
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nonn,bref
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AUTHOR
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Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Dec 21 2007
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