A382189 Expansion of 1/(1 - 4 * Sum_{k>=0} x^(3^k))^(1/2).

1, 2, 6, 22, 82, 312, 1210, 4752, 18834, 75186, 301868, 1217664, 4930918, 20033432, 81621456, 333357656, 1364395770, 5594799576, 22980090870, 94529049296, 389367825444, 1605758772136, 6629456308464, 27397510466856, 113329594803078, 469183242566016, 1943927996932656

Offset: 0

Author

Seiichi Manyama, Mar 18 2025

Keywords

• nonn
• easy

Crossrefs

Cf. A078932, A382190.

Formula

G.f. A(x) satisfies A(x) = 1/(1/A(x^3)^2 - 4*x)^(1/2).