518848domain: NAppears in sequencesG.f. A(x) satisfies A(x) = 1 + x*A(x)/(1 - x*A(x)^2).at n=11A106228Number of Motzkin n-paths avoiding odd-numbered steps that are up steps.at n=21A215067Total number of noncomposite parts in all partitions of n.at n=42A326957