1,2

Rules: all white squares are edge connected; at least 1 white square on every edge of grid; symmetric ones have 180 degree rotational symmetry - Erich Friedman (erich.friedman(AT)stetson.edu)

Cf. A001333, A034184-A034187.

Sequence in context: A064568 A147073 A147191 this_sequence A158653 A129215 A139593

Adjacent sequences: A034182 A034183 A034184 this_sequence A034186 A034187 A034188

nonn

Erich Friedman (erich.friedman(AT)stetson.edu)