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A027766
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(n+1)*C(n+1,6).
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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| 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
| 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
| Sequence in context: A173011 A061429 A048357 * A097299 A104170 A098306
Adjacent sequences: A027763 A027764 A027765 * A027767 A027768 A027769
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KEYWORD
| nonn
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AUTHOR
| thi ngoc dinh (via rkg(AT)cpsc.ucalgary.ca)
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