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 A190955 a(n) = 10*a(n-1) + 5*a(n-2), with a(0)=0, a(1)=1. 3
 0, 1, 10, 105, 1100, 11525, 120750, 1265125, 13255000, 138875625, 1455031250, 15244690625, 159722062500, 1673444078125, 17533051093750, 183697731328125, 1924642568750000, 20164914344140625, 211272356285156250, 2213548134572265625, 23191843127148437500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Table of n, a(n) for n = 0..965 Index entries for linear recurrences with constant coefficients, signature (10,5). FORMULA a(n) = (1/60)*sqrt(30)*((5+sqrt(30))^n - (5-sqrt(30))^n). - Paolo P. Lava, Jun 01 2011 G.f.: x/(1 - 10*x - 5*x^2). - R. J. Mathar, Nov 21 2011 a(n+1) = Sum_{k=0..n} A099089(n,k)*5^k. - Philippe Deléham, Nov 21 2011 MATHEMATICA LinearRecurrence[{10, 5}, {0, 1}, 50] PROG (PARI) x='x+O('x^30); concat([0], Vec(x/(1-10*x-5*x^2))) \\ G. C. Greubel, Jan 25 2018 (MAGMA) I:=[0, 1]; [n le 2 select I[n] else 10*Self(n-1) + 5*Self(n-2): n in [1..30]]; // G. C. Greubel, Jan 25 2018 CROSSREFS Sequence in context: A077369 A068618 A096484 * A004343 A163166 A068767 Adjacent sequences:  A190952 A190953 A190954 * A190956 A190957 A190958 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, May 24 2011 STATUS approved

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Last modified September 20 01:58 EDT 2019. Contains 327207 sequences. (Running on oeis4.)