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Search: id:A027812
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| 21, 224, 1260, 5040, 16170, 44352, 108108, 240240, 495495, 960960, 1769768, 3118752, 5290740, 8682240, 13837320, 21488544, 32605881, 48454560, 70662900, 101301200, 142972830, 198918720, 273136500, 370515600, 496989675
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OFFSET
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0,1
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FORMULA
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Number of 13-subsequences of [ 1, n ] with just 5 contiguous pairs; g.f. 7*(3+5x)/(1-x)^9
C(n+3, 3)*C(n+7, 5) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Sequence in context: A008421 A134585 A135120 this_sequence A027508 A020267 A064322
Adjacent sequences: A027809 A027810 A027811 this_sequence A027813 A027814 A027815
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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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