OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,115598,0,0,0,0,0,0,0,-1).
FORMULA
G.f.: -(x^15 -26*x^14 +157*x^13 -183*x^12 +340*x^11 -4263*x^10 +4603*x^9 -8866*x^8 -57799*x^7 -8866*x^6 -4603*x^5 -4263*x^4 -340*x^3 -183*x^2 -157*x -26)/(x^16 -115598*x^8 +1). - Vincenzo Librandi Nov 21 2013
a(n) = 115598*a(n-8) - a(n-16), - Vincenzo Librandi, Nov 21 2013
MATHEMATICA
Numerator[Convergents[Sqrt[684], 30]] (* or *) CoefficientList[Series[-(x^15 - 26 x^14 + 157 x^13 - 183 x^12 + 340 x^11 - 4263 x^10 + 4603 x^9 - 8866 x^8 - 57799 x^7 - 8866 x^6 - 4603 x^5 - 4263 x^4 - 340 x^3 - 183 x^2 - 157 x - 26)/(x^16 - 115598 x^8 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Nov 21 2013 *)
PROG
(Magma) I:=[26, 157, 183, 340, 4263, 4603, 8866, 57799, 3014414, 18144283, 21158697, 39302980, 492794457, 532097437, 1024891894, 6681448801]; [n le 16 select I[n] else 115598*Self(n-8)-Self(n-16): n in [1..30]]; // Vincenzo Librandi, Nov 21 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved