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 A240892 #6 Jul 23 2025 11:08:18 %S A240892 32,1216,38981,1255585,40424861,1302610899,41971040844,1352138182759, %T A240892 43565815810587,1403705064843757,45228360174728351, %U A240892 1457291782946371386,46955159811511460603,1512935850829951577045,48748133543911846159969 %N A240892 Number of nX7 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order. %C A240892 Column 7 of A240893 %H A240892 R. H. Hardin, <a href="/A240892/b240892.txt">Table of n, a(n) for n = 1..210</a> %e A240892 Some solutions for n=3 %e A240892 ..0..1..0..1..2..0..1....0..1..0..1..0..1..2....0..1..0..2..1..2..0 %e A240892 ..1..0..1..2..1..1..0....2..2..1..0..1..0..1....1..2..1..0..2..1..1 %e A240892 ..0..1..2..0..1..1..2....2..2..0..2..0..1..0....0..1..2..1..0..1..1 %K A240892 nonn %O A240892 1,1 %A A240892 _R. H. Hardin_, Apr 14 2014