0,3

From Vicher's table.

M. Keller, Counting Polyforms

M. Vicher, Polyforms

Sequence in context: A096240 A035080 A091486 this_sequence A102877 A122983 A005355

Adjacent sequences: A056776 A056777 A056778 this_sequence A056780 A056781 A056782

nonn

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

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