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A002250 4^n-2*3^n. 1
-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.: -(1-5*x)/((1-3*x)*(1-4*x)). a(n)=+7*a(n-1)-12*a(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.