

A132644


Xvalues of solutions to the equation X*(X + 1)  13*Y^2 = 0.


0



0, 324, 421200, 546717924, 709639444800, 921111452633124, 1195601955878350800, 1551890417618646705924, 2014352566467047545939200, 2614628079383810095982376324, 3393785232687619037537578530000
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..10.
Index entries for linear recurrences with constant coefficients, signature (1299,1299,1).


FORMULA

a(n) = 1298*a(n1)  a(n2) + 648; a(0)=0, a(1)=324.
a(n) = 1/2 + (1/4)*(649+180*sqrt(13))^n + (1/4)*(649180*sqrt(13))^n, with n >= 0.  Paolo P. Lava, Oct 07 2008
G.f.: 324*x*(x+1)/((x1)*(x^2  1298*x + 1)).  Colin Barker, Oct 25 2012


CROSSREFS

Cf. A007654.
Sequence in context: A298101 A209044 A209016 * A202635 A013763 A013887
Adjacent sequences: A132641 A132642 A132643 * A132645 A132646 A132647


KEYWORD

nonn,easy


AUTHOR

Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Nov 14 2007


EXTENSIONS

More terms from Paolo P. Lava, Oct 07 2008


STATUS

approved



