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Search: id:A091348
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| A091348 |
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a(n)=24*5^n - 60*4^n + 50*3^n - 15*2^n + 1. |
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+0
2
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| 0, 1, 31, 391, 3451, 25231, 164731, 999391, 5767051, 32122831, 174397531, 929043391, 4879252651, 25349936431, 130617150331, 668714319391, 3406562690251, 17286209766031, 87448932863131, 441329102667391
(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^4 Stirling2(n, i)(-1)^(n-i), i=1, .., n)
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MATHEMATICA
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Table[24*5^n - 60*4^n + 50*3^n - 15*2^n + 1, {n, 0, 25}]
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CROSSREFS
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Sequence in context: A042868 A047689 A108268 this_sequence A142829 A022691 A125443
Adjacent sequences: A091345 A091346 A091347 this_sequence A091349 A091350 A091351
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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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