OFFSET
0,1
LINKS
Vincenzo Librandi and Bruno Berselli, Table of n, a(n) for n = 0..200 (first 151 terms from Vincenzo Librandi).
Index entries for linear recurrences with constant coefficients, signature (0,0,0,1154,0,0,0,-1).
FORMULA
G.f.: (11 +34*x +181*x^2 +577*x^3 +181*x^4 -34*x^5 +11*x^6 -x^7) / ((1 -6*x +x^2)*(1 +6*x +x^2)*(1 +34*x^2 +x^4)). [Bruno Berselli, Oct 31 2013]
MATHEMATICA
Numerator[Convergents[Sqrt[128], 30]] (* Vincenzo Librandi, Oct 31 2013 *)
LinearRecurrence[{0, 0, 0, 1154, 0, 0, 0, -1}, {11, 34, 181, 577, 12875, 39202, 208885, 665857}, 30] (* Bruno Berselli, Oct 31 2013 *)
PROG
(Magma) m:=30; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!((11+34*x+181*x^2+577*x^3+181*x^4-34*x^5+11*x^6-x^7)/((1-6*x+x^2)*(1+6*x+x^2)*(1+34*x^2+x^4)))); // Bruno Berselli, Oct 31 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved