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 A203404 #7 Jul 22 2025 17:13:42 %S A203404 14946,225654,2699464,35345798,446672706,5723980832,72950746702, %T A203404 931753350314,11890606324592,151793100413822,1937507658181110, %U A203404 24731882582236020,315690962210495354,4029680331688907654 %N A203404 Number of (n+2)X7 binary arrays avoiding patterns 000 and 111 in rows and columns. %C A203404 Column 5 of A203407 %H A203404 R. H. Hardin, <a href="/A203404/b203404.txt">Table of n, a(n) for n = 1..210</a> %e A203404 Some solutions for n=1 %e A203404 ..1..0..0..1..0..0..1....0..0..1..0..1..0..1....0..0..1..0..1..0..0 %e A203404 ..0..1..1..0..1..1..0....1..0..0..1..0..1..1....1..1..0..1..1..0..1 %e A203404 ..1..0..1..1..0..0..1....0..1..0..1..1..0..0....1..1..0..1..0..1..0 %K A203404 nonn %O A203404 1,1 %A A203404 _R. H. Hardin_ Jan 01 2012