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Search: id:A066459
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| A066459 |
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Product of factorials of the digits of n. |
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+0
2
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| 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 2, 2, 4, 12, 48, 240, 1440, 10080, 80640, 725760, 6, 6, 12, 36, 144, 720, 4320, 30240, 241920, 2177280, 24, 24, 48, 144, 576, 2880, 17280, 120960, 967680
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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If n=10*q+r,(0<=r<10) then a(n)=(q+1+r)!*(sum((-1)^(q-k)*binomial(r,k)/(q+1+r-k),k=0..r)); [From Milan R. Janjic (agnus(AT)blic.net), Dec 14 2008]
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EXAMPLE
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a(24) = (2!) * (4!) = 2 * 24 = 48.
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CROSSREFS
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Sequence in context: A152645 A054873 A072132 this_sequence A071937 A061602 A033647
Adjacent sequences: A066456 A066457 A066458 this_sequence A066460 A066461 A066462
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jan 02 2002
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