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Search: id:A027802
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| 15, 140, 700, 2520, 7350, 18480, 41580, 85800, 165165, 300300, 520520, 866320, 1392300, 2170560, 3294600, 4883760, 7088235, 10094700, 14132580, 19481000, 26476450, 35521200, 47092500, 61752600, 80159625
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OFFSET
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0,1
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FORMULA
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Number of 11-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 5*(3+4x)/(1-x)^8
C(n+3, 3)*C(n+6, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 10 2005
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CROSSREFS
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Sequence in context: A126536 A030056 A123955 this_sequence A133716 A035330 A002803
Adjacent sequences: A027799 A027800 A027801 this_sequence A027803 A027804 A027805
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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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