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 A203406 #7 Jul 22 2025 17:13:57 %S A203406 176238,5327258,119835492,3024430930,72950746702,1791372199364, %T A203406 43680343039806,1068074622125486,26087996711485980,637482788594287422, %U A203406 15574804643638753398,380545025412528955724,9297752486304073629542 %N A203406 Number of (n+2)X9 binary arrays avoiding patterns 000 and 111 in rows and columns. %C A203406 Column 7 of A203407 %H A203406 R. H. Hardin, <a href="/A203406/b203406.txt">Table of n, a(n) for n = 1..210</a> %e A203406 Some solutions for n=3 %e A203406 ..0..1..1..0..0..1..1..0..0....0..0..1..1..0..1..0..1..0 %e A203406 ..1..0..0..1..0..0..1..0..0....1..0..0..1..1..0..0..1..1 %e A203406 ..0..1..0..0..1..1..0..1..1....0..1..0..0..1..0..1..0..1 %e A203406 ..0..0..1..0..0..1..1..0..0....0..0..1..0..0..1..0..1..0 %e A203406 ..1..0..0..1..0..0..1..1..0....1..0..0..1..0..1..1..0..0 %K A203406 nonn %O A203406 1,1 %A A203406 _R. H. Hardin_ Jan 01 2012