0,2

From Vicher's table.

M. Keller, Counting Polyforms

M. Vicher, Polyforms

Sequence in context: A037540 A037484 A013566 this_sequence A064546 A067961 A104127

Adjacent sequences: A056766 A056767 A056768 this_sequence A056770 A056771 A056772

nonn

James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000

Edited by T. D. Noe (noe(AT)sspectra.com), Apr 09 2009