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Search: id:A027808
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| 495, 7150, 55055, 300300, 1301300, 4764760, 15315300, 44341440, 117781950, 290990700, 675745070, 1487285800, 3123300180, 6292363000, 12216990500, 22946695200, 41829913125, 74211187050, 128442439125
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OFFSET
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0,1
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FORMULA
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Number of 17-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 55*(9+4x)/(1-x)^14
C(n+9, 9)*C(n+12, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Sequence in context: A099009 A055160 A055157 this_sequence A104478 A133352 A140913
Adjacent sequences: A027805 A027806 A027807 this_sequence A027809 A027810 A027811
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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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