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 A241127 #6 Jul 23 2025 11:10:59 %S A241127 11,325,9773,295584,8974020,272418756,8270609664,251096788713, %T A241127 7623351508315,231446775293031,7026779711400192,213334731852107120, %U A241127 6476894113062087316,196640073775126182008,5970040263453594766199 %N A241127 Number of nX4 0..2 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..2 introduced in row major order. %C A241127 Column 4 of A241130 %H A241127 R. H. Hardin, <a href="/A241127/b241127.txt">Table of n, a(n) for n = 1..210</a> %e A241127 Some solutions for n=3 %e A241127 ..0..1..2..0....0..1..2..0....0..1..0..1....0..0..1..0....0..0..0..1 %e A241127 ..2..1..2..0....2..1..0..2....2..1..1..2....1..1..2..1....2..0..2..0 %e A241127 ..1..2..0..1....0..2..2..1....0..1..0..1....2..0..0..2....0..2..1..1 %K A241127 nonn %O A241127 1,1 %A A241127 _R. H. Hardin_, Apr 16 2014