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 A354586 #22 Oct 01 2022 19:39:52 %S A354586 1,2,2,3,3,3,4,4,4,4,5,5,1,5,5,6,6,6,6,6,6,7,7,7,7,7,7,7,8,8,8,8,8,8, %T A354586 8,8,9,9,5,9,1,9,5,9,9,10,10,10,10,2,2,10,10,10,10,11,11,11,11,3,3,3, %U A354586 11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12 %N A354586 Table of Sprague-Grundy values for n X m 2D Toppling Dominoes L's read by antidiagonals. %C A354586 2D Toppling Dominoes is played in the same manner as conventional Toppling Dominoes, with the addition of toppling in the north and south directions. An n X m L is defined to be a column of n dominoes and a row of m dominoes intersecting at an endpoint for both row and column. An n X m L comprises n+m-1 dominoes. %C A354586 T(a,b) = T(b,a). %C A354586 It is known that alternating terms on the main diagonal are 1. %C A354586 This table appears to approximate a fractal. %H A354586 Ian C Haile, <a href="https://github.com/IanHaile/2D_Toppling_Dominoes">Python program</a> %K A354586 easy,nonn,tabl %O A354586 1,2 %A A354586 _Ian C Haile_, Aug 18 2022