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Search: id:A014309
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A014309 (n+2)*(n+1)*(n^2+7*n-12)/24. +0
1
-1, 3, 15, 40, 84, 154, 258, 405, 605, 869, 1209, 1638, 2170, 2820, 3604, 4539, 5643, 6935, 8435, 10164, 12144, 14398, 16950, 19825, 23049, 26649, 30653, 35090, 39990, 45384, 51304, 57783, 64855, 72555 (list; graph; listen)
OFFSET

1,2

FORMULA

G.f.:x*(1+x^4-5*x^3+10*x^2-8*x)/(x-1)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 10 2009]

CROSSREFS

Sequence in context: A117561 A065765 A146853 this_sequence A096742 A012256 A012222

Adjacent sequences: A014306 A014307 A014308 this_sequence A014310 A014311 A014312

KEYWORD

sign

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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