A340341 Number of polymings with n cells, distinguishing mirror images.

1, 3, 16, 129, 1009, 8997, 80816, 746483, 6983847, 66146105, 632186200, 6089173570

Offset: 1

Author

George Sicherman, Jan 04 2021

Keywords

• nonn
• hard
• more

Comments

A polyming is a generalized polyiamond whose cells may be joined at corners as well as at edges. I introduced the term in 2010. In A319324 and elsewhere, David Bevan calls these shapes "polyglasses." In A239658, Abe Wits and Ragnar Groot Koerkamp call them simply "triangular polyplets."

Examples

			a(3)=16, because there are 11 two-sided 3-mings (identifying mirror images), and 5 of them are chiral.  See the link above.
		

Links

• G. L. Sicherman, Catalogue of Polymings

Crossrefs

Cf. A239658, A319324.

Extensions

a(11) and a(12) from Aaron N. Siegel, May 22 2022