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 A155155 2*(10*3^n-1). 1
 18, 58, 178, 538, 1618, 4858, 14578, 43738, 131218, 393658, 1180978, 3542938, 10628818, 31886458, 95659378, 286978138, 860934418, 2582803258, 7748409778, 23245229338, 69735688018, 209207064058, 627621192178, 1882863576538 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index to sequences with linear recurrences with constant coefficients, signature (4,-3). FORMULA a(n)= +4*a(n-1) -3*a(n-2). G.f. ( 18-14*x ) / ( (3*x-1)*(x-1) ). a(n) = 10*A048473(n)+8 = A048473(n)+A048473(n+2). a(n)=3a(n-1)-a(n-2)+3a(n-3)+8. PROG (MAGMA) [2*(10*3^n-1): n in [0..30]]; // Vincenzo Librandi, Aug 07 2011 CROSSREFS Sequence in context: A086540 A041634 A044975 * A048356 A027055 A056448 Adjacent sequences:  A155152 A155153 A155154 * A155156 A155157 A155158 KEYWORD nonn,easy AUTHOR Paul Curtz, Jan 21 2009 STATUS approved

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Last modified May 19 21:19 EDT 2013. Contains 225436 sequences.