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 A278723 #4 Nov 27 2016 06:48:31 %S A278723 35,1050,33466,1058494,30942600,815294800,19328645044,414671691083, %T A278723 8109321869307,145580441811727,2414555760264316,37210586178295489, %U A278723 535549333443944707,7231147745218833289,91971617342903492615 %N A278723 Number of nX4 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. %C A278723 Column 4 of A278727. %H A278723 R. H. Hardin, <a href="/A278723/b278723.txt">Table of n, a(n) for n = 1..133</a> %e A278723 Some solutions for n=3 %e A278723 ..1..0..0..0. .1..0..0..0. .2..2..1..0. .3..1..1..1. .1..1..0..0 %e A278723 ..1..0..0..0. .3..1..0..0. .3..0..0..1. .3..2..2..0. .2..1..2..0 %e A278723 ..1..3..1..0. .3..3..2..2. .3..2..1..0. .3..3..1..2. .3..2..1..2 %Y A278723 Cf. A278727. %K A278723 nonn %O A278723 1,1 %A A278723 _R. H. Hardin_, Nov 27 2016