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 A199416 2*7^n+1. 1
 3, 15, 99, 687, 4803, 33615, 235299, 1647087, 11529603, 80707215, 564950499, 3954653487, 27682574403, 193778020815, 1356446145699, 9495123019887, 66465861139203, 465261027974415, 3256827195820899, 22797790370746287 (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 (8,-7). FORMULA a(n) = 3*A083076(n). a(n) = 7*a(n-1)-6. a(n) = 8*a(n-1)-7*a(n-2). G.f.: 3*(1-3*x)/((1-x)*(1-7*x)). PROG (MAGMA) [2*7^n+1: n in [0..30]]; CROSSREFS Sequence in context: A128081 A186264 A140286 * A046635 A208426 A168344 Adjacent sequences:  A199413 A199414 A199415 * A199417 A199418 A199419 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 06 2011 STATUS approved

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Last modified August 6 12:33 EDT 2020. Contains 336246 sequences. (Running on oeis4.)