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 A051407 a(n) = 3^n*(3^(n+1)+1)/2. 1
 2, 15, 126, 1107, 9882, 88695, 797526, 7175547, 64573362, 581140575, 5230206126, 47071677987, 423644570442, 3812799539655, 34315191073926, 308836705316427, 2779530304801122, 25015772614069935, 225141953139208926, 2026277577090618867, 18236498190328785402 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Colin Barker, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (12,-27). FORMULA From Colin Barker, Feb 10 2016: (Start) a(n) = 12*a(n-1) - 27*a(n-2) for n>1. G.f.: (2-9*x) / ((1-3*x)*(1-9*x)). (End) PROG (PARI) Vec((2-9*x)/((1-3*x)*(1-9*x)) + O(x^100)) \\ Colin Barker, Feb 10 2016 CROSSREFS Sequence in context: A341726 A055866 A364978 * A371580 A242091 A132182 Adjacent sequences: A051404 A051405 A051406 * A051408 A051409 A051410 KEYWORD nonn,easy AUTHOR Colin Mallows STATUS approved

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Last modified May 21 07:02 EDT 2024. Contains 372729 sequences. (Running on oeis4.)