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Search: id:A027788
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| 105, 1800, 16320, 104040, 523260, 2209320, 8139600, 26860680, 80901810, 225544440, 588376800, 1448655000, 3389852700, 7582037400, 16287339600, 33738060600, 67621543875, 131530532400, 248917996800
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OFFSET
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0,1
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FORMULA
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Number of 18-subsequences of [ 1, n ] with just 2 contiguous pairs; g.f. 15*(7+x)/(1-x)^17
C(n+14, n)*C(n+15, 2) - Zerinvary Lajos (zlaja(AT)freemail.hu), Apr 28 2005
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CROSSREFS
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Adjacent sequences: A027785 A027786 A027787 this_sequence A027789 A027790 A027791
Sequence in context: A051015 A076377 A024198 this_sequence A112497 A122814 A112490
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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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