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 A166114 a(n)=(6-(-4)^n)/5. 2
 1, 2, -2, 14, -50, 206, -818, 3278, -13106, 52430, -209714, 838862, -4677718, 17388602, -70876678, 282184442, -1130060038, 4518917883, -18076993798, 72306652922, -289227933958, 1156910413562, -4627642976518, 18510570583802 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(0)= 1, a(1)= 2, a(n)= 4*a(n-2)-3*a(n-1) for n>1. a(n)= 6-4*a(n-1), a(0)=1 . a(n)= a(n-1)+(-4)^(n-1), a(0)=1 . G.f.: (1+5x)/(1+3x-4x^2). E.g.f.: (6exp(x)-exp(-4x))/5. CROSSREFS Cf. A084222, A084247 Sequence in context: A151353 A151437 A194689 * A202730 A009773 A185044 Adjacent sequences:  A166111 A166112 A166113 * A166115 A166116 A166117 KEYWORD easy,sign AUTHOR Philippe DELEHAM, Oct 06 2009 STATUS approved

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