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 A319324 #22 Jun 06 2024 12:28:24 %S A319324 2,12,88,710,6054,53500,484784,4475010,41902626,396838992,3793117200, %T A319324 36534684066 %N A319324 a(n) is the number of fixed polyglasses (polyiamonds which need only touch at corners) with n cells. %C A319324 Polyglasses are to polyiamonds (A001420) as polyplets (A006770) are to polyominoes (A001168). The name derives from the 2-celled animal (diglass) which looks like an hourglass. %H A319324 David Bevan, <a href="/A319324/a319324.png">The 88 fixed triglasses.</a> %H A319324 Rebecca M. Bowen, Sadie Pruitt, and Douglas A. Torrance, <a href="https://arxiv.org/abs/2405.20793">Properties of regular Tangles</a>, arXiv:2405.20793 [math.CO], 2024. See p. 2. %H A319324 Adam Gruber, <a href="https://devweb3000.cis.strath.ac.uk/~xpb16190/LatticeAnimals/LatticeAnimals.jar">Java program to count lattice animals</a>. %e A319324 a(2) = 12: three rotations of a diamond, three rotations of an hourglass and six rotations of "two mountains". %Y A319324 Cf. A001420 (fixed polyiamonds), A319325 (row convex polyglasses), A319326 (column convex polyglasses). %K A319324 nonn,more,hard %O A319324 1,1 %A A319324 _David Bevan_, Sep 18 2018 %E A319324 a(12) from _Aaron N. Siegel_, May 22 2022