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 A205751 #7 Jul 22 2025 19:00:24 %S A205751 11143,68692,1320659,14131118,233316016,2917623614,45262306396, %T A205751 599332178604,8912114399864,121869298507748,1770968194811994, %U A205751 24619794382545970,353501675583395156,4957479622063690252 %N A205751 Number of (n+1)X7 0..2 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..2 introduced in row major order. %C A205751 Column 6 of A205753 %H A205751 R. H. Hardin, <a href="/A205751/b205751.txt">Table of n, a(n) for n = 1..210</a> %e A205751 Some solutions for n=4 %e A205751 ..0..0..1..2..2..2..1....0..0..1..2..0..0..1....0..1..0..1..1..2..0 %e A205751 ..2..0..1..1..2..1..1....0..1..1..2..2..0..1....2..1..2..2..0..2..1 %e A205751 ..1..0..2..0..2..0..2....2..2..0..0..1..0..2....1..1..1..2..2..2..1 %e A205751 ..2..1..0..1..0..1..0....1..2..2..0..0..0..0....0..2..0..0..1..0..1 %e A205751 ..1..1..0..1..0..1..0....1..0..1..1..2..1..2....0..2..2..0..0..0..0 %K A205751 nonn %O A205751 1,1 %A A205751 _R. H. Hardin_ Jan 30 2012