OFFSET
1,2
COMMENTS
Also, the number of partitions of n such that (greatest part) <= 3*(number of parts).
FORMULA
G.f.: Sum_{k>=1} x^k * Product_{j=1..k} (1-x^(3*k+j-1))/(1-x^j).
PROG
(PARI) my(N=66, x='x+O('x^N)); Vec(sum(k=1, N, x^k*prod(j=1, k, (1-x^(3*k+j-1))/(1-x^j))))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jan 25 2022
STATUS
approved