OFFSET
0,7
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: Sum_{k>=0} x^(4*k)/Product_{j=1..3*k} (1-x^j).
EXAMPLE
a(7) = 3 counts these partitions: 331, 3211, 31111.
PROG
(PARI) a(n) = sum(k=0, n\4, #partitions(n-4*k, 3*k));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 16 2023
STATUS
approved