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 A185834 #9 Jul 22 2025 10:03:25 %S A185834 13,1103,17877,257050,4143707,68363184,1073661088,17200095426, %T A185834 278159538826,4418356392225,71020967453692,1136704302337236, %U A185834 18204389915482609,291581361291318489,4670236803825684178 %N A185834 Half the number of nX8 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors. %C A185834 Column 8 of A185835 %H A185834 R. H. Hardin, <a href="/A185834/b185834.txt">Table of n, a(n) for n = 1..101</a> %e A185834 Some solutions for 4X8 with a(1,1)=0 %e A185834 ..0..0..0..1..1..0..0..0....0..0..0..0..0..0..1..1....0..1..1..0..1..0..1..1 %e A185834 ..0..1..1..0..0..1..1..1....0..1..1..1..1..1..0..0....0..1..0..0..1..0..0..1 %e A185834 ..0..0..0..1..0..1..0..0....0..1..0..0..0..0..1..1....0..1..1..1..0..1..1..1 %e A185834 ..1..1..1..1..0..0..1..1....0..0..1..1..1..0..0..1....0..0..0..0..0..1..0..0 %K A185834 nonn %O A185834 1,1 %A A185834 _R. H. Hardin_ Feb 05 2011