1,2

Rotations and reflections are allowed, I believe. I have verified the first three entries by hand. The terms 255 and 2874 were taken from the Vicher web page. - N. J. A. Sloane (njas(AT)research.att.com).

N. J. A. Sloane, Rough sketches illustrating first three terms

M. Vicher, Polyforms

Index entries for sequences related to dominoes

Cf. A121194.

Sequence in context: A052577 A052880 A090357 this_sequence A006056 A098620 A002465

Adjacent sequences: A056783 A056784 A056785 this_sequence A056787 A056788 A056789

nonn,nice,more

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

Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 17 2006