A382335 Expansion of ( 1 + 4 * Sum_{k>=0} x^(2^k)/(1 - x^(2^k))^2 )^(1/2).

1, 2, 4, -2, 10, -2, -20, 82, -108, -114, 1052, -2702, 2054, 11394, -52636, 99534, 32938, -831698, 2649676, -3119694, -8779530, 54334130, -125649628, 31877726, 849214460, -3274210670, 5129552132, 7097067566, -65583106070, 180299051838, -133300439300

Offset: 0

Author

Seiichi Manyama, Mar 22 2025

Keywords

• sign
• easy

Crossrefs

Cf. A129527, A382336.

Cf. A223142, A382333.

Formula

G.f. A(x) satisfies A(x) = ( A(x^2)^2 + 4*x/(1-x)^2 )^(1/2).