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 A231695 #6 Jul 23 2025 06:37:36 %S A231695 16,272,5972,115583,2049855,37872601,711067486,13223846355, %T A231695 245394073602,4563802124823,84893857186798,1578413939501222, %U A231695 29347570955255809,545714251340861077,10147343140331608494,188682437852956208517 %N A231695 Number of nX3 0..3 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. %C A231695 Column 3 of A231700 %H A231695 R. H. Hardin, <a href="/A231695/b231695.txt">Table of n, a(n) for n = 1..210</a> %e A231695 Some solutions for n=4 %e A231695 ..1..0..0....1..0..3....1..0..0....0..0..2....0..0..1....0..1..2....1..2..1 %e A231695 ..1..0..1....0..0..0....0..0..3....0..2..3....0..0..1....0..0..2....1..0..0 %e A231695 ..3..0..0....1..2..0....0..2..0....0..0..1....0..2..2....0..0..2....0..0..3 %e A231695 ..0..0..1....2..1..0....0..0..0....0..0..3....3..3..3....0..3..2....0..1..1 %K A231695 nonn %O A231695 1,1 %A A231695 _R. H. Hardin_, Nov 12 2013