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 A222287 #6 Jul 23 2025 02:28:48 %S A222287 4,8,83,1125,6582,89852,564838,7879795,50958999,723447048,4750196831, %T A222287 67994171066,451003258750,6495868727212,43379306929941, %U A222287 627562261878355,4211483429644946,61133435798313074,411800332378830207 %N A222287 Number of nX5 0..1 arrays with exactly floor(nX5/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order. %C A222287 Column 5 of A222290 %H A222287 R. H. Hardin, <a href="/A222287/b222287.txt">Table of n, a(n) for n = 1..79</a> %e A222287 Some solutions for n=4 %e A222287 ..0..1..0..0..0....0..0..0..0..0....0..0..0..1..1....0..0..0..1..0 %e A222287 ..0..1..0..0..0....1..0..0..0..0....1..0..1..1..1....0..0..0..0..0 %e A222287 ..0..0..1..0..0....0..0..0..0..0....1..1..0..1..1....0..0..0..1..0 %e A222287 ..0..0..0..0..0....1..0..0..1..0....1..1..1..1..1....0..0..1..0..0 %K A222287 nonn %O A222287 1,1 %A A222287 _R. H. Hardin_ Feb 14 2013