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 A278629 #4 Nov 24 2016 10:19:52 %S A278629 1,285,10824,234484,3739008,48592635,541463431,5325263364,47098291840, %T A278629 379621129293,2817194942225,19407777240447,124964309624036, %U A278629 756392815286668,4325156175914066,23464134450391209,121221027131246039 %N A278629 Number of nX3 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. %C A278629 Column 3 of A278634. %H A278629 R. H. Hardin, <a href="/A278629/b278629.txt">Table of n, a(n) for n = 1..210</a> %H A278629 R. H. Hardin, <a href="/A278629/a278629.txt">Empirical polynomial of degree 70</a> %F A278629 Empirical polynomial of degree 70 (see link above) %e A278629 Some solutions for n=3 %e A278629 ..1..2..1. .2..0..2. .1..0..2. .2..0..1. .2..0..0. .2..2..1. .0..1..0 %e A278629 ..0..0..0. .0..2..0. .0..0..1. .0..2..1. .2..1..2. .2..1..2. .2..2..2 %e A278629 ..1..1..0. .2..2..2. .1..0..1. .1..0..2. .2..0..0. .1..2..1. .1..0..0 %Y A278629 Cf. A278634. %K A278629 nonn %O A278629 1,2 %A A278629 _R. H. Hardin_, Nov 24 2016