OFFSET
0,2
FORMULA
G.f. A(x) satisfies A(x) = (1 + x)^3 * A(x^3).
PROG
(PARI) my(N=90, x='x+O('x^N)); Vec(prod(k=0, logint(N, 3), 1+x^3^k)^3)
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jul 14 2024
STATUS
approved