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 A221175 a(0)=-5, a(1)=6; thereafter a(n) = 2*a(n-1) + a(n-2). 5
 -5, 6, 7, 20, 47, 114, 275, 664, 1603, 3870, 9343, 22556, 54455, 131466, 317387, 766240, 1849867, 4465974, 10781815, 26029604, 62841023, 151711650, 366264323, 884240296, 2134744915, 5153730126, 12442205167, 30038140460, 72518486087, 175075112634 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..1000 José L. Ramírez, Gustavo N. Rubiano, and Rodrigo de Castro, A Generalization of the Fibonacci Word Fractal and the Fibonacci Snowflake, arXiv preprint arXiv:1212.1368 [cs.DM], 2012-2014. Index entries for linear recurrences with constant coefficients, signature (2,1). FORMULA a(n) = 16*A000129(n)-5*A000129(n+1). - R. J. Mathar, Jan 14 2013 G.f.: -(16*x-5) / (x^2+2*x-1). - Colin Barker, Jul 10 2015 PROG (Haskell) a221175 n = a221175_list !! n a221175_list = -5 : 6 : zipWith (+) (map (* 2) \$ tail a221175_list) a221175_list -- Reinhard Zumkeller, Jan 04 2013 (PARI) Vec(-(16*x-5)/(x^2+2*x-1) + O(x^50)) \\ Colin Barker, Jul 10 2015 CROSSREFS Cf. A000129, A078343, A221172, A221173, A221174. Sequence in context: A347807 A161925 A078694 * A048007 A273402 A217295 Adjacent sequences: A221172 A221173 A221174 * A221176 A221177 A221178 KEYWORD sign,easy AUTHOR N. J. A. Sloane, Jan 04 2013 STATUS approved

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Last modified September 12 04:22 EDT 2024. Contains 375842 sequences. (Running on oeis4.)