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 A185565 #7 Jul 22 2025 09:55:06 %S A185565 4096,45562500,504547256880,5586628402633500,61858104930689319360, %T A185565 684925618712729136913980,7583858300260627032845531520, %U A185565 83972485690826213759616527499540,929787724653148422947168982361958940 %N A185565 1/4 the number of nX7 0..3 arrays with no element equal both to the element above and to the element to its left. %C A185565 Column 7 of A185567 %H A185565 R. H. Hardin, <a href="/A185565/b185565.txt">Table of n, a(n) for n = 1..200</a> %e A185565 Some solutions for 3X7 with a(1,1)=0 %e A185565 ..0..0..0..0..0..0..1....0..0..0..0..1..1..2....0..0..0..0..2..0..2 %e A185565 ..0..2..0..2..2..1..3....0..2..0..2..0..0..2....0..2..0..2..1..0..2 %e A185565 ..0..0..2..0..0..1..3....0..0..2..0..1..0..3....0..0..2..0..1..3..0 %K A185565 nonn %O A185565 1,1 %A A185565 _R. H. Hardin_ Jan 31 2011