A014309 - OEIS

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A014309

(n+2)*(n+1)*(n^2+7*n-12)/24.

-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; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 1..725`
	FORMULA	`G.f.:x(1+x^4-5x^3+10x^2-8x)/(x-1)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 10 2009]`
	MATHEMATICA	`Table[(n+2)(n+1)(n^2+7n-12)/24, {n, 40}] (* From Harvey P. Dale, Feb 20 2011 *)`
	PROG	`(MAGMA) [(n+2)(n+1)(n^2+7*n-12)/24: n in [1..50]]; // Vincenzo Librandi, Apr 25 2011`
	CROSSREFS	`Sequence in context: A065765 A146853 A183476 * A096742 A012256 A012222` `Adjacent sequences: A014306 A014307 A014308 * A014310 A014311 A014312`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 13 21:59 EST 2012. Contains 205562 sequences.