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 A168589 a(n) = (2 - 3^n)*(-1)^n. 3
 1, 1, -7, 25, -79, 241, -727, 2185, -6559, 19681, -59047, 177145, -531439, 1594321, -4782967, 14348905, -43046719, 129140161, -387420487, 1162261465, -3486784399, 10460353201, -31381059607, 94143178825, -282429536479 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS A signed version of A058481 preceded by 1. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (-4, -3). FORMULA a(n) = -4*a(n-1) - 3*a(n-2) for n > 1; a(0) = 1, a(1) = 1. G.f.: (1 + 5*x)/((1+x)*(1+3*x)). E.g.f.: 2*exp(-x) - exp(-3*x). - G. C. Greubel, Jul 26 2016 MATHEMATICA Table[(2 - 3^n)*(-1)^n, {n, 0, 50}] (* G. C. Greubel, Jul 26 2016 *) PROG (Magma) [ (2-3^n)*(-1)^n: n in [0..25] ]; (PARI) a(n)=(2-3^n)*(-1)^n \\ Charles R Greathouse IV, Jul 26 2016 CROSSREFS Cf. A058481 (3^n-2). Sequence in context: A155281 A155254 A155295 * A058481 A220387 A155294 Adjacent sequences: A168586 A168587 A168588 * A168590 A168591 A168592 KEYWORD sign,easy AUTHOR Klaus Brockhaus, Nov 30 2009 STATUS approved

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Last modified January 29 21:02 EST 2023. Contains 359931 sequences. (Running on oeis4.)