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 A268104 #4 Jan 26 2016 12:19:42 %S A268104 2,9,64,615,7536,112476,1981512,40265487,927338710,23873974553, %T A268104 679478391252,21185458961316,718142599280848,26296505423775240, %U A268104 1034431689380433024,43505385550994833263,1948060006167232265688 %N A268104 Number of 1Xn 0..n arrays with every repeated value in every row and column greater than or equal to the previous repeated value. %C A268104 Row 1 of A268103. %H A268104 R. H. Hardin, <a href="/A268104/b268104.txt">Table of n, a(n) for n = 1..193</a> %e A268104 Some solutions for n=5 %e A268104 ..0..2..1..4..5....2..3..2..1..5....2..3..0..5..2....2..5..0..5..3 %Y A268104 Cf. A268103. %K A268104 nonn %O A268104 1,1 %A A268104 _R. H. Hardin_, Jan 26 2016