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Search: id:A027806
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| 210, 2640, 17820, 85800, 330330, 1081080, 3123120, 8168160, 19691100, 44341440, 94225560, 190466640, 368588220, 686439600, 1235591280, 2157381600, 3665097150, 6074125200, 9842332500, 15623407800
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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Number of 15-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 30*(7+4x)/(1-x)^12
C(n+7, 7)*C(n+10, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Sequence in context: A104902 A135201 A064260 this_sequence A024407 A027822 A024449
Adjacent sequences: A027803 A027804 A027805 this_sequence A027807 A027808 A027809
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KEYWORD
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nonn
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AUTHOR
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thi ngoc dinh (via rkg(AT)cpsc.ucalgary.ca)
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