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Search: id:A027811
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| 6, 63, 336, 1260, 3780, 9702, 22176, 46332, 90090, 165165, 288288, 482664, 779688, 1220940, 1860480, 2767464, 4029102, 5753979, 8075760, 11157300, 15195180, 20424690, 27125280, 35626500, 46314450, 59638761, 76120128
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OFFSET
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0,1
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FORMULA
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Number of 12-subsequences of [ 1, n ] with just 5 contiguous pairs; g.f. 3*(2+5x)/(1-x)^8
C(n+2, 2)*C(n+6, 5) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Sequence in context: A121251 A158987 A055005 this_sequence A027950 A053700 A123615
Adjacent sequences: A027808 A027809 A027810 this_sequence A027812 A027813 A027814
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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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