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Search: id:A005096
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| 1, 0, 0, 3, 20, 115, 714, 5033, 40312, 362871, 3628790, 39916789, 479001588, 6227020787, 87178291186, 1307674367985, 20922789887984, 355687428095983, 6402373705727982, 121645100408831981
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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McCombinations: in 2002, McDonalds advertised a McChoice menu of 8 items under the heading "40,312 combinations" rather than the more obvious 2^8-1=255 (A000225). The Advertising Standards Authority "considered that the number quoted in the advertisement was not necessarily so exaggerated as to be misleading". - Henry Bottomley (se16(AT)btinternet.com), May 01 2003
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LINKS
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Index entries for sequences related to factorial numbers
Advertising Standards Authority, McDonald's Restaurants Ltd.
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FORMULA
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a(n) = n*a(n-1)+n(n-2) = n*A033312(n-1) = A000142(n)-n. - Henry Bottomley (se16(AT)btinternet.com), May 01 2003
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MATHEMATICA
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lst={}; Do[AppendTo[lst, n!-n], {n, 3*4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 20 2008]
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CROSSREFS
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Sequence in context: A139471 A154641 A108911 this_sequence A164535 A001652 A128910
Adjacent sequences: A005093 A005094 A005095 this_sequence A005097 A005098 A005099
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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