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Search: id:A027803
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| 35, 350, 1890, 7350, 23100, 62370, 150150, 330330, 675675, 1301300, 2382380, 4176900, 7054320, 11531100, 18314100, 28352940, 42902475, 63596610, 92534750, 132382250, 186486300, 259008750, 355077450, 480957750, 644245875
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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 4 contiguous pairs; g.f. 35*(1+x)/(1-x)^9
C(n+4, n)*C(n+7, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), Apr 27 2005
C(n+5, 5)*C(n+7, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 10 2005
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CROSSREFS
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Equals 35*A053347(n).
Cf. A062145.
Adjacent sequences: A027800 A027801 A027802 this_sequence A027804 A027805 A027806
Sequence in context: A071697 A027792 A101099 this_sequence A073567 A133458 A075664
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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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