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 A185563 #8 May 07 2022 22:02:03 %S A185563 256,202500,159749820,126017211780,99407416968000,78416544382742160, %T A185563 61858104930689319360,48796145962555619907720, %U A185563 38492350573406180494467240,30364304873646611423433030660,23952577505016018447231455650500 %N A185563 1/4 the number of n X 5 0..3 arrays with no element equal both to the element above and to the element to its left. %C A185563 Column 5 of A185567. %H A185563 R. H. Hardin, <a href="/A185563/b185563.txt">Table of n, a(n) for n = 1..169</a> %F A185563 Empirical: a(n) = 829*a(n-1)-32339*a(n-2)+525706*a(n-3)-4547088*a(n-4)+22231638*a(n-5)-58780485*a(n-6)+68179725*a(n-7)-10661625*a(n-8). %e A185563 Some solutions for 3 X 5 with a(1,1)=0. %e A185563 ..0..0..0..2..3....0..0..0..3..0....0..0..2..2..1....0..0..0..0..2 %e A185563 ..0..2..2..0..0....0..2..0..0..1....0..2..0..1..2....0..2..2..0..1 %e A185563 ..0..0..3..2..0....0..0..1..3..1....0..0..2..1..2....0..2..3..3..1 %Y A185563 Cf. A185567. %K A185563 nonn %O A185563 1,1 %A A185563 _R. H. Hardin_, Jan 31 2011