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 A343993 #7 May 21 2021 07:03:58 %S A343993 5,37,353,1761,8917,26773,84497,215545,508613,1044825,2184125,4036481, %T A343993 7550669,13068897,21666789,34540637,55656469,84953609,130542493, %U A343993 192747673,278927225,393687369,559130085,770515489,1059144047 %N A343993 Number of nodes in the graph AC(n,n). %C A343993 Taken from _Lars Blomberg_'s b-file for A288180. %H A343993 Lars Blomberg, Scott R. Shannon, and N. J. A. Sloane, <a href="http://neilsloane.com/doc/rose_5.pdf">Graphical Enumeration and Stained Glass Windows, 1: Rectangular Grids</a>, (2020). Also arXiv:2009.07918. %Y A343993 Main diagonal of triangle A288180. %K A343993 nonn %O A343993 1,1 %A A343993 _N. J. A. Sloane_, May 17 2021