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Search: id:A027821
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| 84, 1050, 6930, 32340, 120120, 378378, 1051050, 2642640, 6126120, 13273260, 27159132, 52907400, 98760480, 177578940, 308897820, 521694096, 858049500, 1377926550, 2165313150, 3336032700, 5047562520
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OFFSET
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0,1
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FORMULA
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Number of 16-subsequences of [ 1, n ] with just 6 contiguous pairs; g.f. 42*(2+3x)/(1-x)^11
C(n+4, 4)*C(n+9, 6) - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 08 2005
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CROSSREFS
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Adjacent sequences: A027818 A027819 A027820 this_sequence A027822 A027823 A027824
Sequence in context: A069080 A093284 A027794 this_sequence A092719 A105942 A008359
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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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