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Search: id:A027823
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A027823 77*(n+1)*C(n+6,11). +0
1
462, 6468, 48048, 252252, 1051050, 3699696, 11435424, 31855824, 81477396, 193993800, 434546112, 923410488, 1873980108, 3651858672, 6864396000, 12493200720, 22086194130, 38030772780, 63935791920, 105157552500 (list; graph; listen)
OFFSET

0,1

FORMULA

Number of 18-subsequences of [ 1, n ] with just 6 contiguous pairs; g.f. 462*(1+x)/(1-x)^13

C(n+6, 6)*C(n+11, 6) - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 08 2005

CROSSREFS

Cf. A062190.

Sequence in context: A104397 A108749 A027816 this_sequence A023912 A027565 A035847

Adjacent sequences: A027820 A027821 A027822 this_sequence A027824 A027825 A027826

KEYWORD

nonn

AUTHOR

thi ngoc dinh (via rkg(AT)cpsc.ucalgary.ca)

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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