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 A278622 #4 Nov 24 2016 08:41:22 %S A278622 16,357,4754,49503,439446,3438414,24103803,153073965,888863183, %T A278622 4758719096,23665023516,110046094356,481337375925,1990600963219, %U A278622 7819169497216,29290369365213,105007107699726,361416768054859 %N A278622 Number of nX3 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. %C A278622 Column 3 of A278627. %H A278622 R. H. Hardin, <a href="/A278622/b278622.txt">Table of n, a(n) for n = 1..210</a> %H A278622 R. H. Hardin, <a href="/A278622/a278622.txt">Empirical polynomial of degree 43</a> %F A278622 Empirical polynomial of degree 43 (see link above) %e A278622 Some solutions for n=4 %e A278622 ..1..1..0. .2..2..0. .2..1..0. .0..2..1. .2..1..0. .2..0..0. .1..2..0 %e A278622 ..0..0..2. .1..1..0. .0..0..0. .2..0..1. .0..1..2. .2..1..0. .2..0..0 %e A278622 ..2..0..0. .2..0..1. .0..1..0. .2..2..2. .0..2..0. .0..0..2. .2..1..1 %e A278622 ..2..0..1. .2..2..1. .2..0..2. .2..2..2. .2..0..2. .1..2..2. .2..2..0 %Y A278622 Cf. A278627. %K A278622 nonn %O A278622 1,1 %A A278622 _R. H. Hardin_, Nov 24 2016