9957376domain: NAppears in sequencesNumber of rooted unicursal planar maps with n edges and no vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).at n=9A069721A transform of C(n,7).at n=10A082141Expansion of sqrt(8*x + sqrt(1 + 64*x^2)).at n=10A261196