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 A183449 #7 Jun 02 2025 03:17:35 %S A183449 1,253,1505,7761,176949,1817225,16192521,216103851,2491241396, %T A183449 26807184942,319246780548,3727927654904,42498891259325, %U A183449 496063346878031,5787799084661820,67059980281582582,780988033705277709 %N A183449 Number of nX8 binary arrays with every 1 having exactly two king-move neighbors equal to 1. %C A183449 Column 8 of A183450 %H A183449 R. H. Hardin, <a href="/A183449/b183449.txt">Table of n, a(n) for n = 1..198</a> %e A183449 Some solutions for 5X8 %e A183449 ..0..1..0..0..1..1..0..0....0..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0 %e A183449 ..1..1..0..0..1..0..0..1....0..1..1..0..0..1..1..0....0..0..1..0..0..0..1..1 %e A183449 ..0..0..0..0..0..0..1..1....0..0..0..0..1..0..0..1....0..1..1..0..0..0..1..0 %e A183449 ..1..0..0..0..0..0..0..0....1..1..0..0..0..1..1..0....0..0..0..0..1..0..0..0 %e A183449 ..1..1..0..0..0..0..0..0....1..0..0..0..0..0..0..0....0..0..0..0..1..1..0..0 %K A183449 nonn %O A183449 1,2 %A A183449 _R. H. Hardin_ Jan 04 2011