A382336 Expansion of ( 1 + 9 * Sum_{k>=0} x^(2^k)/(1 - x^(2^k))^2 )^(1/3).

1, 3, 0, 0, 21, -111, 504, -2004, 7092, -21150, 43614, 24288, -949878, 7022118, -38308320, 175670820, -691787607, 2250673143, -4994247456, -2841846468, 120496073523, -931900270923, 5282041372722, -25033533979260, 101401747872534, -337523450786736, 757180705527738

Offset: 0

Author

Seiichi Manyama, Mar 22 2025

Keywords

• sign
• easy

Crossrefs

Cf. A129527, A382335.

Cf. A223143, A382334.

Formula

G.f. A(x) satisfies A(x) = ( A(x^2)^3 + 9*x/(1-x)^2 )^(1/3).