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 A278725 #6 Apr 17 2022 20:48:33 %S A278725 84,10401,2487889,815294800,279368748599,90462380211862, %T A278725 26947618206791521,7361981179311574929,1850980180963910285369, %U A278725 430395479744245915185211,93005966539515246802755901 %N A278725 Number of n X 6 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. %C A278725 Column 6 of A278727. %H A278725 R. H. Hardin, <a href="/A278725/b278725.txt">Table of n, a(n) for n = 1..19</a> %e A278725 Some solutions for n=2 %e A278725 ..2..2..1..0..0..0. .3..1..1..1..1..0. .3..3..1..1..1..0. .2..2..2..1..1..1 %e A278725 ..3..0..0..1..1..1. .3..3..3..1..1..3. .3..3..3..1..1..0. .3..1..0..2..2..2 %Y A278725 Cf. A278727. %K A278725 nonn %O A278725 1,1 %A A278725 _R. H. Hardin_, Nov 27 2016