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 A231223 #7 Jul 23 2025 06:19:11 %S A231223 6,17,54,182,812,2962,12179,50196,205057,864270,3593492,15094003, %T A231223 63545858,267204717,1127304903,4753575829,20059305680,84691952803, %U A231223 357558971694,1510077601850,6377796652031,26938452104661,113791455759187 %N A231223 Number of (n+2)X(4+2) 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. %C A231223 Column 4 of A231227 %H A231223 R. H. Hardin, <a href="/A231223/b231223.txt">Table of n, a(n) for n = 1..210</a> %H A231223 R. H. Hardin, <a href="/A231223/a231223.txt">Empirical recurrence of order 96</a> %F A231223 Empirical recurrence of order 96 (see link above) %e A231223 Some solutions for n=5 %e A231223 ..0..0..0..0..1..1....0..0..0..0..0..0....0..0..1..1..1..1....0..0..0..1..1..1 %e A231223 ..0..0..0..0..1..1....0..0..1..1..0..0....0..0..1..1..1..1....0..0..0..1..1..1 %e A231223 ..0..0..0..1..1..1....1..1..1..1..1..1....0..0..0..1..1..1....0..0..0..0..1..1 %e A231223 ..0..0..1..1..2..2....1..1..1..1..1..1....2..2..0..0..0..0....0..0..0..0..1..1 %e A231223 ..1..1..1..2..2..2....2..2..1..1..1..1....2..2..2..0..0..0....0..0..1..1..0..0 %e A231223 ..1..1..2..2..2..2....2..2..2..2..2..2....2..2..2..0..0..0....1..1..1..1..0..0 %e A231223 ..1..1..2..2..2..2....2..2..2..2..2..2....2..2..2..0..0..0....1..1..1..1..0..0 %K A231223 nonn %O A231223 1,1 %A A231223 _R. H. Hardin_, Nov 05 2013