2,2
The path may be open or closed. For larger n several solutions with the same number of segments exist.
Hugo Pfoertner, Examples of compact self avoiding paths on a square lattice.
Cf. A122223, A122226.
Sequence in context: A088804 A027924 A006578 * A183955 A004797 A053459
Adjacent sequences: A122221 A122222 A122223 * A122225 A122226 A122227
hard,more,nonn
Hugo Pfoertner (hugo(AT)pfoertner.org), Sep 25 2006