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 A203405 #7 Jul 22 2025 17:13:50 %S A203405 51384,1098136,18021052,327725888,5723980832,101578277384, %T A203405 1791372199364,31670053199428,559357046066336,9883171811276912, %U A203405 174597648846078920,3084652717804631472,54495922517693646532,962777163534286799196 %N A203405 Number of (n+2)X8 binary arrays avoiding patterns 000 and 111 in rows and columns. %C A203405 Column 6 of A203407 %H A203405 R. H. Hardin, <a href="/A203405/b203405.txt">Table of n, a(n) for n = 1..210</a> %e A203405 Some solutions for n=1 %e A203405 ..0..1..0..0..1..1..0..0....1..0..0..1..0..1..0..0....1..1..0..1..1..0..1..1 %e A203405 ..1..0..1..0..1..0..1..0....0..1..0..1..0..1..0..1....0..0..1..0..1..1..0..0 %e A203405 ..0..0..1..1..0..1..0..1....1..0..1..0..1..0..1..0....0..1..1..0..0..1..0..0 %K A203405 nonn %O A203405 1,1 %A A203405 _R. H. Hardin_ Jan 01 2012