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 A231858 #6 Jun 02 2025 08:48:42 %S A231858 27,377,12404,360966,11149456,342945563,10582191628,326538750032, %T A231858 10077070157886,310990560701053,9597588422538259,296194800363244561, %U A231858 9140981229461743667,282103332885578653809,8706099363813295026694 %N A231858 Number of 4Xn 0..2 arrays with no element having a strict majority of its horizontal and antidiagonal neighbors equal to itself plus one mod 3, with upper left element zero (rock paper and scissors drawn positions). %C A231858 Row 4 of A231855 %H A231858 R. H. Hardin, <a href="/A231858/b231858.txt">Table of n, a(n) for n = 1..210</a> %e A231858 Some solutions for n=3 %e A231858 ..0..0..1....0..0..1....0..0..2....0..0..1....0..2..2....0..0..2....0..0..0 %e A231858 ..0..1..0....0..1..1....0..2..0....2..2..2....2..2..0....0..1..1....0..0..0 %e A231858 ..0..0..0....1..2..1....1..1..0....0..0..2....2..0..1....1..1..0....0..1..2 %e A231858 ..1..0..0....0..1..1....2..0..0....1..2..2....2..2..2....0..0..1....2..0..0 %K A231858 nonn %O A231858 1,1 %A A231858 _R. H. Hardin_, Nov 14 2013