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URL: https://oeis.org/A374627

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A374627
Expansion of Product_{k>=0} 1 / (1 - x^(3^k))^3.
1
1, 3, 6, 13, 24, 39, 64, 99, 144, 212, 303, 417, 578, 786, 1041, 1382, 1809, 2322, 2985, 3798, 4761, 5973, 7434, 9144, 11247, 13743, 16632, 20126, 24225, 28929, 34541, 41061, 48489, 57242, 67320, 78723, 92029, 107238, 124350, 144151, 166641, 191820, 220729, 253368, 289737, 331218, 377811
OFFSET
0,2
FORMULA
G.f. A(x) satisfies A(x) = A(x^3)/(1 - x)^3.
PROG
(PARI) my(N=50, x='x+O('x^N)); Vec(1/prod(k=0, logint(N, 3), 1-x^3^k)^3)
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jul 14 2024
STATUS
approved