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 A222189 #12 Jan 20 2018 16:10:46 %S A222189 4,13,36,158,708,4236,26412,180070,1256914,8999762,65225244,477772294, %T A222189 3525803320,26185264801,195490126328,1466095545930,11038514989344, %U A222189 83401050695432,632087998742988,4803854169636124,36600736833265244,279496328812771427 %N A222189 Number of toroidal n X 3 binary arrays, allowing rotation and/or reflection of the rows and/or the columns. %H A222189 S. N. Ethier, <a href="http://arxiv.org/abs/1301.2352">Counting toroidal binary arrays</a>, arXiv preprint arXiv:1301.2352, 2013 and <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Ethier/ethier2.html">J. Int. Seq. 16 (2013) #13.4.7</a>. %Y A222189 A column of A222188. %K A222189 nonn %O A222189 1,1 %A A222189 _N. J. A. Sloane_, Feb 12 2013 %E A222189 More terms from _Michel Marcus_, Feb 13 2013