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 A199113 (11*3^n+1)/2. 4
 6, 17, 50, 149, 446, 1337, 4010, 12029, 36086, 108257, 324770, 974309, 2922926, 8768777, 26306330, 78918989, 236756966, 710270897, 2130812690, 6392438069, 19177314206, 57531942617, 172595827850, 517787483549, 1553362450646, 4660087351937 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (4,-3). FORMULA a(n) = 3*a(n-1)-1. a(n) = 4*a(n-1)-3*a(n-2). G.f.: (6-7*x)/((1-x)*(1-3*x)).  - Bruno Berselli, Nov 04 2011 MATHEMATICA LinearRecurrence[{4, -3}, {6, 17}, 30] (* or *) (11 3^Range[0, 30]+1)/2 (* Harvey P. Dale, Mar 25 2012 *) PROG (MAGMA) [(11*3^n+1)/2: n in [0..30]]; CROSSREFS Sequence in context: A054492 A128525 A083334 * A297297 A241352 A239796 Adjacent sequences:  A199110 A199111 A199112 * A199114 A199115 A199116 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 04 2011 STATUS approved

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Last modified March 26 12:43 EDT 2019. Contains 321497 sequences. (Running on oeis4.)