OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..100
FORMULA
a(n) = [x^(n*(n+1)/2)] 1 / (1 - x - x^3) for n>=0.
MATHEMATICA
Table[SeriesCoefficient[1/(1 - x - x^3), {x, 0, n*(n + 1)/2}], {n, 0, 50}] (* G. C. Greubel, Apr 26 2017 *)
PROG
(PARI) {a(n) = polcoeff(1/(1-x-x^3 + x*O(x^(n*(n+1)/2))), n*(n+1)/2)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 13 2013
STATUS
approved