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 A278632 #4 Nov 24 2016 10:22:02 %S A278632 357,175881,48592635,11719632199,2593097277036,521528860552802, %T A278632 94782697883923436,15624069731088285787,2357725621673408985921, %U A278632 329332639476242364241409,43040255418713805460253898 %N A278632 Number of nX6 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. %C A278632 Column 6 of A278634. %H A278632 R. H. Hardin, <a href="/A278632/b278632.txt">Table of n, a(n) for n = 1..46</a> %e A278632 Some solutions for n=2 %e A278632 ..1..0..0..2..1..0. .0..0..0..2..0..2. .1..0..1..2..0..0. .2..1..0..0..2..0 %e A278632 ..2..0..1..1..1..2. .1..1..0..0..0..2. .2..1..1..2..0..0. .0..0..2..1..0..2 %Y A278632 Cf. A278634. %K A278632 nonn %O A278632 1,1 %A A278632 _R. H. Hardin_, Nov 24 2016