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Search: id:A027817
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A027817 99*(n+1)*C(n+5,12). +0
1
792, 11583, 90090, 495495, 2162160, 7963956, 25729704, 74826180, 199536480, 494684190, 1152323172, 2543258718, 5354228880, 10811423700, 21034470600, 39583049220, 72282089880, 128442439125, 222633561150 (list; graph; listen)
OFFSET

0,1

FORMULA

Number of 18-subsequences of [ 1, n ] with just 5 contiguous pairs; g.f. 99*(8+5x)/(1-x)^14

C(n+8, 8)*C(n+12, 5) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005

CROSSREFS

Sequence in context: A072722 A167587 A104398 this_sequence A104680 A037190 A140909

Adjacent sequences: A027814 A027815 A027816 this_sequence A027818 A027819 A027820

KEYWORD

nonn

AUTHOR

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

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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