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 A240647 #6 Jul 23 2025 11:04:47 %S A240647 5,10,60,168,953,5304,29481,168320,990468,5920658,36118925,223452736, %T A240647 1398014617,8822174770,56061936636,358120024848,2296837339689, %U A240647 14776222949736,95279221861053,615439624491192,3980504657629172 %N A240647 Number of nX6 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order. %C A240647 Column 6 of A240649 %H A240647 R. H. Hardin, <a href="/A240647/b240647.txt">Table of n, a(n) for n = 1..210</a> %e A240647 Some solutions for n=4 %e A240647 ..0..1..0..1..0..1....0..0..0..1..1..1....0..1..0..0..1..0....0..1..0..1..1..1 %e A240647 ..0..1..0..1..0..1....1..0..1..0..1..0....0..1..1..1..1..0....0..1..0..0..0..0 %e A240647 ..1..1..1..1..1..1....1..0..1..0..1..0....1..1..1..0..1..0....0..1..0..1..0..1 %e A240647 ..0..0..0..0..0..1....1..0..1..0..1..0....0..0..1..0..1..0....0..1..0..1..0..1 %K A240647 nonn %O A240647 1,1 %A A240647 _R. H. Hardin_, Apr 09 2014