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 A060182 a(0) = 1, a(1) = 5, a(2) = 13; a(n) = 2*a(n-1) + 2, n > 2. 2
 1, 5, 13, 28, 58, 118, 238, 478, 958, 1918, 3838, 7678, 15358, 30718, 61438, 122878, 245758, 491518, 983038, 1966078, 3932158, 7864318, 15728638, 31457278, 62914558, 125829118, 251658238, 503316478, 1006632958, 2013265918 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Sometimes confused with A002717. LINKS Harry J. Smith, Table of n, a(n) for n = 0..200 FORMULA a(n) = 3(a(n-1) - a(n-2) + a(n-3) - ... ((-1)^(n+1))*a(0))+1; a(n) = (2^(n-3))*a(3) + (2^(n-2)) - 2 for n > 3. From R. J. Mathar, Jul 15 2009: (Start) G.f.: -(1+x)*(x^2-x-1)/((-1+x)*(-1+2*x)). a(n) = 15*2^(n-2) - 2, n > 1. (End) PROG (PARI) { a=-1; for (n=0, 200, a=2*a + 2; if (n<3, a++); write("b060182.txt", n, " ", a); ) } \\ Harry J. Smith, Jul 02 2009 CROSSREFS Sequence in context: A027962 A023537 A023653 * A357945 A147066 A189485 Adjacent sequences: A060179 A060180 A060181 * A060183 A060184 A060185 KEYWORD nonn,easy AUTHOR Brian Wallace (wallacebrianedward(AT)yahoo.co.uk), Mar 19 2001 EXTENSIONS Simpler formula and more terms from Larry Reeves (larryr(AT)acm.org), Mar 30 2001 Edited by N. J. A. Sloane at the suggestion of Philippe LALLOUET (philip.lallouet(AT)wanadoo.fr), Sep 16 2007 STATUS approved

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Last modified December 9 19:36 EST 2022. Contains 358703 sequences. (Running on oeis4.)