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 A268028 #4 Jan 24 2016 14:12:01 %S A268028 63,3969,250047,13530274,687233742,32747526923,1486191908610, %T A268028 64725260937166,2722665554883854,111163751115106132, %U A268028 4422667685678114786,172002220213857351197,6556076286013521999466,245446300682062937711088 %N A268028 Number of 4Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value. %C A268028 Row 4 of A268026. %H A268028 R. H. Hardin, <a href="/A268028/b268028.txt">Table of n, a(n) for n = 1..210</a> %e A268028 Some solutions for n=2 %e A268028 ..1..1....2..1....1..1....0..0....2..1....2..2....1..0....2..1....0..0....1..2 %e A268028 ..2..0....2..1....2..2....2..2....1..2....0..1....0..0....1..0....0..0....2..1 %e A268028 ..1..1....0..2....2..1....0..1....2..0....1..2....1..1....0..2....2..1....2..2 %e A268028 ..1..1....2..2....1..1....0..0....2..1....2..0....1..0....1..0....1..0....1..1 %Y A268028 Cf. A268026. %K A268028 nonn %O A268028 1,1 %A A268028 _R. H. Hardin_, Jan 24 2016