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 A199299 a(n) = (2*n + 1)*6^n. 2
 1, 18, 180, 1512, 11664, 85536, 606528, 4199040, 28553472, 191476224, 1269789696, 8344332288, 54419558400, 352638738432, 2272560758784, 14575734521856, 93096626946048, 592433080565760, 3757718396731392 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (12,-36). FORMULA a(n) = 12*a(n-1) - 36*a(n-2). G.f.: (1+6*x)/(1-6*x)^2. a(n) = 6*a(n-1) + 2*6^n. - Vincenzo Librandi, Nov 05 2011 PROG (MAGMA) [(2*n+1)*6^n: n in [0..30]]; // Vincenzo Librandi, Nov 05 2011 CROSSREFS Sequence in context: A121038 A004410 A140325 * A155669 A160954 A160955 Adjacent sequences:  A199296 A199297 A199298 * A199300 A199301 A199302 KEYWORD nonn,easy AUTHOR Philippe Deléham, Nov 04 2011 STATUS approved

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Last modified March 28 11:00 EDT 2020. Contains 333083 sequences. (Running on oeis4.)