o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o David Wilson wrote: > > A006394(3) = 3. What are the three connected planar graphs with three nodes? it says "Connected planar maps with n nodes", i don't know the definition of "map" in play. it would have to be rooted graphs to be 3. o | o---o o o o \ / | \ / @ @ @ o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o~~~~~~~~~o