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Search: id:A027796
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| 165, 2200, 15730, 80080, 325325, 1121120, 3403400, 9335040, 23556390, 55426800, 122862740, 258658400, 520550030, 1006778080, 1879537000, 3399510400, 5975701875, 10236025800, 17125658550, 28042014000
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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 3 contiguous pairs; g.f. 55*(3+x)/(1-x)^13
C(n+9, 9)*C(n+11, 3) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 13 2005
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CROSSREFS
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Sequence in context: A135806 A124409 A066177 this_sequence A105944 A071576 A132055
Adjacent sequences: A027793 A027794 A027795 this_sequence A027797 A027798 A027799
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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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