OFFSET
0,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = sqrt(6)/2.
MATHEMATICA
z = 30; r = Sqrt[6]/2;
f[x_] := f[x] = Sum[Floor[r*(k + 1)] x^k, {k, 0, z}]; f[x]
CoefficientList[Series[1/f[x], {x, 0, 2*z}], x]
PROG
(PARI) r = sqrt(6)/2;
Vec(1/sum(k=0, 60, floor(r*(k + 1))*x^k) + O(x^61)) \\ Indranil Ghosh, Mar 30 2017
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Clark Kimberling, Dec 16 2016
STATUS
approved