622616

Appears in sequences

• Number of nonisomorphic unrooted unicursal planar maps with n edges and two vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).at n=9A069725
• Meandric numbers for a river crossing up to 5 parallel roads at n points.at n=15A208126
• Number of endless self-avoiding walks of length n for the body centered cubic lattice.at n=6A334333