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 A222770 #6 Jul 23 2025 03:02:46 %S A222770 0,3,4,11,18,73,152,470,1022,3361,7840,23386,57626,172387,434280, %T A222770 1257025,3275034,9399647,24776572,70325187,188540168,531573662, %U A222770 1436226680,4032772569,10987025446,30742228871,84180549328,235159618106 %N A222770 Number of 2Xn 0..1 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222770 Row 2 of A222769 %H A222770 R. H. Hardin, <a href="/A222770/b222770.txt">Table of n, a(n) for n = 1..107</a> %e A222770 All solutions for n=3 %e A222770 ..0..0..0....0..0..0....0..0..1....0..0..1 %e A222770 ..0..1..1....1..0..0....1..1..1....0..0..0 %K A222770 nonn %O A222770 1,2 %A A222770 _R. H. Hardin_ Mar 05 2013