A382196 Expansion of (1 + 9 * Sum_{k>=0} x^(3^k))^(1/3).

1, 3, -9, 48, -288, 1917, -13563, 99927, -758079, 5879757, -46401705, 371337021, -3005974710, 24568145019, -202442064183, 1679864383800, -14024716370064, 117715927282470, -992725129013121, 8407191323492226, -71467963130581758, 609605555349330009

Offset: 0

Author

Seiichi Manyama, Mar 18 2025

Keywords

• sign
• easy

Comments

This sequence is different from A298308.

Crossrefs

Cf. A223142, A223143, A298308, A382190.

Formula

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