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 A130214 Order of modular group of degree 5^(n-1)+1. 0
 0, 60, 7800, 976500, 122070000, 15258787500, 1907348625000, 238418579062500, 29802322387500000, 3725290298460937500, 465661287307734375000, 58207660913467382812500, 7275957614183425781250000, 909494701772928237304687500, 113686837721616029736328125000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES E. Mathieu, Memoire sur le nombre de valeurs que peut acquerir une fonction quand on y permute ses variables de toutes les manieres possibles, Journ. de math. (2) 5 (1860), 9-42 (see p. 39). LINKS Index entries for linear recurrences with constant coefficients, signature (130,-625). FORMULA a(n) = 5^(n - 1) (5^(2 n - 2) - 1)/2. a(n) = 130*a(n-1)-625*a(n-2). G.f.: 60*x^2 / ((5*x-1)*(125*x-1)). - Colin Barker, Sep 02 2013 MATHEMATICA Table[5^(x - 1) (5^(2 x - 2) - 1)/2, {x, 1, 15}] CROSSREFS Cf. A120689. Sequence in context: A091753 A303790 A327678 * A295815 A146498 A003750 Adjacent sequences:  A130211 A130212 A130213 * A130215 A130216 A130217 KEYWORD nonn,easy AUTHOR Artur Jasinski, Aug 04 2007 EXTENSIONS More terms from Colin Barker, Sep 02 2013 STATUS approved

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Last modified February 25 22:55 EST 2020. Contains 332270 sequences. (Running on oeis4.)