OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (20,1).
FORMULA
From Philippe Deléham, Nov 21 2008: (Start)
a(n) = 20*a(n-1) + a(n-2) for n > 1, a(0)=10, a(1)=201.
G.f.: (10+x)/(1-20*x-x^2). (End)
MATHEMATICA
CoefficientList[Series[(10 + x)/(1 - 20 x - x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 30 2013 *)
Numerator[Convergents[Sqrt[101], 20]] (* Bruno Berselli, Oct 30 2013 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved