187057domain: NAppears in sequencesNumber of 2-linear trees on n nodes.at n=26A338706Erroneous version of A338706.at n=26A338710G.f. A(x) satisfies 1/x = Sum_{n=-oo..+oo} A(x)^n * (1 + A(x)^(2*n+1))^(n+1).at n=10A378830