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 A267979 #3 Jan 23 2016 10:05:24 %S A267979 804,646416,519718464,370962601314,247835569655956,156061390092021574, %T A267979 93595257134450725384,53846326808056805339811, %U A267979 29887153373333642722563504 %N A267979 Number of 5Xn 0..3 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value. %C A267979 Row 5 of A267974. %e A267979 Some solutions for n=1 %e A267979 ..3....2....0....2....3....3....3....3....0....2....1....2....0....1....3....0 %e A267979 ..2....1....2....0....1....2....2....3....2....0....3....1....3....3....0....0 %e A267979 ..1....0....0....3....3....0....3....2....3....3....2....2....2....3....0....2 %e A267979 ..1....3....1....2....3....3....3....1....2....2....1....1....1....0....1....1 %e A267979 ..0....1....1....1....1....2....1....3....3....2....3....0....0....3....1....0 %Y A267979 Cf. A267974. %K A267979 nonn %O A267979 1,1 %A A267979 _R. H. Hardin_, Jan 23 2016