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 A203403 #7 Jul 22 2025 17:13:35 %S A203403 4374,46746,408432,3858082,35345798,327725888,3024430930,27962750194, %T A203403 258345914196,2387518651034,22061941665806,203872962398440, %U A203403 1883944523165954,17409227897045550,160875446788528448 %N A203403 Number of (n+2)X6 binary arrays avoiding patterns 000 and 111 in rows and columns. %C A203403 Column 4 of A203407 %H A203403 R. H. Hardin, <a href="/A203403/b203403.txt">Table of n, a(n) for n = 1..210</a> %e A203403 Some solutions for n=2 %e A203403 ..0..1..0..1..0..1....0..1..0..1..0..0....1..0..1..0..1..0....1..1..0..1..0..1 %e A203403 ..0..1..1..0..1..0....0..1..0..0..1..0....0..0..1..0..1..1....1..0..0..1..1..0 %e A203403 ..1..0..0..1..0..1....1..0..1..0..0..1....1..1..0..1..0..0....0..1..1..0..0..1 %e A203403 ..1..0..0..1..0..1....1..0..1..1..0..0....0..1..0..1..1..0....1..0..1..1..0..0 %K A203403 nonn %O A203403 1,1 %A A203403 _R. H. Hardin_ Jan 01 2012