11068567domain: NPropertiesPrimalityPrimeyesAppears in sequencesG.f. A(x) satisfies A(x) = 1 + x*A(x)/(1 - x*A(x)^2).at n=13A106228Number of Motzkin n-paths avoiding odd-numbered steps that are up steps.at n=25A215067Prime numbersat n=730745