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Search: id:A110903
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| A110903 |
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Difference between the factorial of n and the double factorial of n. |
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+0
2
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| 0, 0, 0, 3, 16, 105, 672, 4935, 39936, 361935, 3624960, 39906405, 478955520, 6226885665, 87177646080
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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a(n) = n! - n!!
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EXAMPLE
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a(7)= 7*6*5*4*3*2*1 - 7*5*3*1 =4935
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MATHEMATICA
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Table[(n!-n!!), {n, 0, 15}] - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 21 2007
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CROSSREFS
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Sequence in context: A091637 A074542 A105622 this_sequence A085614 A014304 A063548
Adjacent sequences: A110900 A110901 A110902 this_sequence A110904 A110905 A110906
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KEYWORD
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easy,nonn
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AUTHOR
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Paolo P. Lava (ppl(AT)spl.at), Sep 21 2005
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