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 A222576 #5 Jul 23 2025 02:47:20 %S A222576 14,18,120,435,3516,25441,212957,1933819,17971162,172292518, %T A222576 1649722196,15907967878,153952727468,1485280127413,14446587454682, %U A222576 139301828808661,1359137046700841 %N A222576 Number of 4Xn 0..2 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order. %C A222576 Row 4 of A222573 %e A222576 Some solutions for n=3 %e A222576 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..1 %e A222576 ..0..0..0....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0....0..0..0 %e A222576 ..1..0..2....0..0..0....1..0..2....0..0..0....0..0..0....0..0..2....0..0..0 %e A222576 ..2..0..0....1..1..1....0..0..0....1..0..0....0..0..1....0..0..0....0..0..2 %K A222576 nonn %O A222576 1,1 %A A222576 _R. H. Hardin_ Feb 25 2013