



2, 6, 30, 146, 698, 3358, 16342, 80298, 397170, 1972790, 9824654, 49005250, 244672042, 1222297422, 6108298566, 30531927002, 152630937314, 763068593254, 3815084686078, 19074648589554, 95370918424986, 476847618556286
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OFFSET

0,1


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (10,32,38,15).


FORMULA

G.f.: 2*(17*x+17*x^219*x^3)/((15*x)*(13*x)*(1x)^2).  Vincenzo Librandi, Feb 26 2013


MATHEMATICA

Table[3^n + 5^n  2 n, {n, 0, 30}] (* or *) CoefficientList[Series[2 (1  7 x + 17 x^2  19 x^3)/((1  5 x) (1  3 x) (1  x)^2), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 26 2013 *)
LinearRecurrence[{10, 32, 38, 15}, {2, 6, 30, 146}, 30] (* Harvey P. Dale, Apr 27 2016 *)


PROG

(MAGMA) [3^n+5^n2*n: n in [0..30]]; // Vincenzo Librandi, Feb 27 2013


CROSSREFS

Cf. A074606, A005058.
Sequence in context: A073969 A295863 A224530 * A055695 A113593 A122763
Adjacent sequences: A120947 A120948 A120949 * A120951 A120952 A120953


KEYWORD

nonn,easy


AUTHOR

Mohammad K. Azarian, Aug 19 2006


EXTENSIONS

Edited by Ray Chandler, Sep 06 2006


STATUS

approved



