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Search: id:A027785
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| 66, 936, 7098, 38220, 163800, 594048, 1893528, 5441904, 14360580, 35271600, 81477396, 178474296, 373173528, 748843200, 1448655000, 2711882160, 4928324310, 8718517080, 15049821150, 25401694500, 41997468240
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OFFSET
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0,1
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FORMULA
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Number of 15-subsequences of [ 1, n ] with just 2 contiguous pairs; g.f. 6*(11+2x)/(1-x)^14
C(n+11, 11)*C(n+12, 2) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 13 2005
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CROSSREFS
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Sequence in context: A128952 A101093 A056468 this_sequence A104673 A133318 A017782
Adjacent sequences: A027782 A027783 A027784 this_sequence A027786 A027787 A027788
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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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