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 A231403 #5 Jul 23 2025 06:28:06 %S A231403 87,95,5834,62039,1158551,22654165,374180527,7170248270 %N A231403 Number of (7+1)X(n+1) 0..2 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. %C A231403 Row 7 of A231396 %e A231403 Some solutions for n=4 %e A231403 ..0..0..0..1..1....0..1..0..0..0....0..0..0..0..0....0..0..0..0..0 %e A231403 ..0..0..0..1..1....1..0..1..0..0....1..1..0..0..0....0..0..0..0..0 %e A231403 ..0..0..0..1..1....0..1..0..1..0....1..1..1..0..0....0..0..0..0..0 %e A231403 ..0..0..1..1..1....0..0..1..0..1....1..1..2..2..2....0..0..0..1..1 %e A231403 ..1..1..1..2..2....0..0..0..1..0....1..2..2..2..2....2..2..1..1..1 %e A231403 ..1..1..2..2..2....0..0..1..0..1....2..1..2..1..1....2..2..2..1..1 %e A231403 ..0..0..0..2..2....1..1..0..1..0....1..2..1..1..1....2..2..2..2..1 %e A231403 ..0..0..0..0..0....1..1..1..0..1....2..1..2..2..2....1..1..1..1..2 %K A231403 nonn %O A231403 1,1 %A A231403 _R. H. Hardin_, Nov 08 2013