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Search: id:A027804
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| 70, 756, 4410, 18480, 62370, 180180, 462462, 1081080, 2342340, 4764760, 9189180, 16930368, 29980860, 51279480, 85058820, 137287920, 216228474, 333125100, 503052550, 745945200, 1087836750, 1562340780, 2212405650
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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 4 contiguous pairs; g.f. 14*(5+4x)/(1-x)^10
C(n+5, 5)*C(n+8, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 10 2005
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CROSSREFS
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Sequence in context: A007330 A060541 A104475 this_sequence A006037 A002975 A061170
Adjacent sequences: A027801 A027802 A027803 this_sequence A027805 A027806 A027807
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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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