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Search: id:A027809
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| 715, 11011, 90090, 520520, 2382380, 9189180, 31039008, 94225560, 261891630, 675745070, 1636014380, 3747960216, 8180071900, 17103786700, 34420042800, 66927861000, 126159017985, 231196390425
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OFFSET
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0,1
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FORMULA
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Number of 18-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 143*(5+2x)/(1-x)^15
C(n+10, 10)*C(n+13, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Adjacent sequences: A027806 A027807 A027808 this_sequence A027810 A027811 A027812
Sequence in context: A058324 A005467 A029565 this_sequence A030537 A140919 A034587
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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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