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 A037617 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,2. 6
 1, 13, 132, 1321, 13213, 132132, 1321321, 13213213, 132132132, 1321321321, 13213213213, 132132132132, 1321321321321, 13213213213213, 132132132132132, 1321321321321321, 13213213213213213, 132132132132132132, 1321321321321321321, 13213213213213213213, 132132132132132132132 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..21. Index entries for linear recurrences with constant coefficients, signature (10,0,1,-10). FORMULA G.f.: x*(1+x)*(2*x+1) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Aug 12 2013 a(n) ~ (44/333)*10^n = (44/333)*A011557(n). - Stefano Spezia, Oct 15 2023 MATHEMATICA Table[FromDigits[PadRight[{}, n, {1, 3, 2}]], {n, 20}] (* Harvey P. Dale, Mar 29 2015 *) CROSSREFS Cf. A011557. Sequence in context: A295349 A161498 A037715 * A295603 A199144 A198664 Adjacent sequences: A037614 A037615 A037616 * A037618 A037619 A037620 KEYWORD nonn,base AUTHOR Clark Kimberling EXTENSIONS a(17)-a(21) from Stefano Spezia, Oct 15 2023 STATUS approved

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Last modified May 30 18:48 EDT 2024. Contains 372974 sequences. (Running on oeis4.)