A002250 - OEIS

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A002250

4^n-2*3^n.

-1, -2, -2, 10, 94, 538, 2638, 12010, 52414, 222778, 930478, 3840010, 15714334, 63920218, 258869518, 1045044010, 4208873854, 16921588858, 67944635758, 272553384010, 1092538058974, 4377125804698, 17529423925198 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`Index to sequences with linear recurrences with constant coefficients, signature (7,-12).`
	FORMULA	`G.f.: -(1-5x)/((1-3x)(1-4x)). a(n)=+7a(n-1)-12a(n-2) for n>1. - Bruno Berselli, Jan 25 2011`
	CROSSREFS	`A005061, A000244.` `Sequence in context: A052647 A181334 A032034 * A011248 A069240 A000371` `Adjacent sequences: A002247 A002248 A002249 * A002251 A002252 A002253`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 15:39 EST 2012. Contains 205635 sequences.