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 A231942 #6 Jul 23 2025 06:44:30 %S A231942 64,318,8426,206808,4736026,94464137,1919281092,41278336185, %T A231942 897740885078,19169895279256,405027273733561,8590742778707213, %U A231942 183219148883189294,3908854794384722672,83220827197605442257,1770396034339882044148 %N A231942 Number of 3Xn 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors. %C A231942 Row 3 of A231940 %H A231942 R. H. Hardin, <a href="/A231942/b231942.txt">Table of n, a(n) for n = 1..210</a> %e A231942 Some solutions for n=4 %e A231942 ..0..0..1..1....0..0..1..1....0..0..0..3....0..2..0..1....0..0..1..1 %e A231942 ..0..0..2..1....0..1..2..2....0..2..0..0....0..0..2..0....3..3..0..0 %e A231942 ..1..0..0..2....0..0..1..2....1..0..1..2....2..0..0..1....0..0..0..2 %K A231942 nonn %O A231942 1,1 %A A231942 _R. H. Hardin_, Nov 15 2013