167256domain: NAppears in sequencesG.f. satisfies A(x) = 1/(1 - x*(1 + x*A(x))^2).at n=11A161634The number of semi-meanders with n top arches and concentric arches within the starting arch or a starting arch with length one.at n=14A330269Number of strict compositions of n that are neither increasing nor decreasing.at n=35A333149