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Search: id:A091347
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| A091347 |
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a(n)=6*4^n - 12*3^n + 7*2^n - 1. |
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+0
2
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| 0, 1, 15, 115, 675, 3451, 16275, 72955, 316275, 1340251, 5590035, 23054395, 94314675, 383578651, 1553331795, 6270493435, 25253701875, 101530450651, 407669649555, 1635323974075, 6555235693875, 26262769508251
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n)=Sum(i!i^3 Stirling2(n, i)(-1)^(n-i), i=1, .., n)
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MATHEMATICA
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Table[6*4^n - 12*3^n + 7*2^n - 1, {n, 0, 25}]
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CROSSREFS
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Sequence in context: A044347 A113527 A044728 this_sequence A125352 A126510 A139615
Adjacent sequences: A091344 A091345 A091346 this_sequence A091348 A091349 A091350
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Jan 03 2004
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