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 A278724 #4 Nov 27 2016 06:49:16 %S A278724 56,3492,306070,30942600,3062815568,279368748599,23161560633508, %T A278724 1747727428639023,120668752462156921,7668150385606788285, %U A278724 451008119329650593967,24676136165708649853590,1261674436562343441025436 %N A278724 Number of nX5 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. %C A278724 Column 5 of A278727. %H A278724 R. H. Hardin, <a href="/A278724/b278724.txt">Table of n, a(n) for n = 1..53</a> %e A278724 Some solutions for n=2 %e A278724 ..2..1..1..1..1. .1..0..0..0..0. .3..2..2..1..1. .1..1..1..0..0 %e A278724 ..2..2..1..1..0. .1..3..2..2..0. .3..2..2..3..1. .2..2..2..2..0 %Y A278724 Cf. A278727. %K A278724 nonn %O A278724 1,1 %A A278724 _R. H. Hardin_, Nov 27 2016