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 A199300 a(n) = (2*n + 1)*7^n. 1
 1, 21, 245, 2401, 21609, 184877, 1529437, 12353145, 98001617, 766718533, 5931980229, 45478515089, 346032180025, 2616003280989, 19668469112621, 147174406808233, 1096686708796833, 8142067989552245, 60251303122686613 (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 (14,-49). FORMULA a(n) = 14*a(n-1) - 49*a(n-2). G.f.: (1+7*x)/(1-7*x)^2. a(n) = 7*a(n-1) + 2*7^n. - Vincenzo Librandi, Nov 05 2011 PROG (MAGMA) [(2*n+1)*7^n: n in [0..30]]; // Vincenzo Librandi, Nov 05 2011 CROSSREFS Sequence in context: A198974 A271792 A177730 * A302992 A165095 A165099 Adjacent sequences:  A199297 A199298 A199299 * A199301 A199302 A199303 KEYWORD nonn,easy AUTHOR Philippe Deléham, Nov 04 2011 EXTENSIONS a(15) corrected by Vincenzo Librandi, Nov 05 2011 STATUS approved

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Last modified April 3 14:25 EDT 2020. Contains 333197 sequences. (Running on oeis4.)