A382368 Expansion of 1/( 1 - 4 * Sum_{k>=0} x^(3^k) / (1 - x^(3^k)) )^(1/2).

1, 2, 8, 36, 162, 750, 3536, 16858, 81100, 392914, 1914268, 9369190, 46032396, 226898158, 1121510176, 5556731592, 27589816042, 137240945530, 683808343416, 3412128301538, 17048743841882, 85286538527304, 427112389604968, 2141096012912290, 10743017708448232

Offset: 0

Author

Seiichi Manyama, Mar 22 2025

Keywords

• nonn

Crossrefs

Cf. A382367, A382369.

Formula

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