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Search: id:A027766
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| 6, 49, 224, 756, 2100, 5082, 11088, 22308, 42042, 75075, 128128, 210392, 334152, 515508, 775200, 1139544, 1641486, 2321781, 3230304, 4427500, 5985980, 7992270, 10548720, 13775580, 17813250, 22824711, 28998144
(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 8-subsequences of [ 1, n ] with just 1 contiguous pair; g.f. (6+x)/(1-x)^8
C(n+6, 6)*C(n+6, 1) - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 08 2005
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MAPLE
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a:=n->sum(binomial(n, 6), j=1..n): seq(a(n), n=6..33); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 12 2007
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CROSSREFS
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Sequence in context: A028308 A061429 A048357 this_sequence A097299 A104170 A098306
Adjacent sequences: A027763 A027764 A027765 this_sequence A027767 A027768 A027769
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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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