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Search: id:A027790
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| 10, 80, 350, 1120, 2940, 6720, 13860, 26400, 47190, 80080, 130130, 203840, 309400, 456960, 658920, 930240, 1288770, 1755600, 2355430, 3116960, 4073300, 5262400, 6727500, 8517600, 10687950, 13300560, 16424730, 20137600
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OFFSET
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0,1
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FORMULA
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Number of 9-subsequences of [ 1, n ] with just 3 contiguous pairs; g.f. 10*(1+x)/(1-x)^7
C(n+3, 3)*C(n+5, 3) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 13 2005
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CROSSREFS
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Sequence in context: A006329 A077245 A036732 this_sequence A000575 A055285 A036070
Adjacent sequences: A027787 A027788 A027789 this_sequence A027791 A027792 A027793
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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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