50746domain: NAppears in sequencesTriangular array associated with Schroeder numbers.at n=52A033878T(n, k) counts Schroeder n-paths whose ascent starting at the initial vertex has length k. Triangle T(n,k), read by rows.at n=47A132372G.f. satisfies A(x) = ( 1 + x * (1 + x*A(x)^2) )^2.at n=10A371607