This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A340341 #13 Apr 26 2023 07:07:51 %S A340341 1,3,16,129,1009,8997,80816,746483,6983847,66146105,632186200, %T A340341 6089173570 %N A340341 Number of polymings with n cells, distinguishing mirror images. %C A340341 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." %H A340341 G. L. Sicherman, <a href="https://sicherman.net/polymings/">Catalogue of Polymings</a> %e A340341 a(3)=16, because there are 11 two-sided 3-mings (identifying mirror images), and 5 of them are chiral. See the link above. %Y A340341 Cf. A239658, A319324. %K A340341 nonn,hard,more %O A340341 1,2 %A A340341 _George Sicherman_, Jan 04 2021 %E A340341 a(11) and a(12) from _Aaron N. Siegel_, May 22 2022