G.f.: 1 = ...((((1/(1-x) - a(1)*x )^2 - a(2)*x^2 )^2 - a(3)*x^3 )^2 - a(4)*x^4 )^2 -..., an infinite series of nested squares.

A274961

G.f.: 1 = ...((((1/(1-x) - a(1)*x )^2 - a(2)*x^2 )^2 - a(3)*x^3 )^2 - a(4)*x^4 )^2 -..., an infinite series of nested squares.