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 A185566 #7 Jul 22 2025 09:55:13 %S A185566 16384,683437500,28355191537860,1176277376648694960, %T A185566 48796145962555619907720,2024236566241727245692157080, %U A185566 83972485690826213759616527499540,3483475434832751291309593655505225600 %N A185566 1/4 the number of nX8 0..3 arrays with no element equal both to the element above and to the element to its left. %C A185566 Column 8 of A185567 %H A185566 R. H. Hardin, <a href="/A185566/b185566.txt">Table of n, a(n) for n = 1..158</a> %e A185566 Some solutions for 3X8 with a(1,1)=0 %e A185566 ..0..0..0..0..0..0..1..3....0..0..0..0..0..0..1..1....0..0..0..0..0..2..2..1 %e A185566 ..0..2..0..2..2..0..0..1....0..2..0..2..2..2..3..1....0..2..0..2..2..0..2..3 %e A185566 ..0..0..2..0..0..2..0..3....0..0..2..0..0..2..2..1....0..0..2..0..2..0..0..1 %K A185566 nonn %O A185566 1,1 %A A185566 _R. H. Hardin_ Jan 31 2011