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 A278854 #4 Nov 29 2016 10:28:10 %S A278854 8,7072,731444,44571591,2167109763,92891826961,3637198028018, %T A278854 131770344218055,4438698421228261,139356074010503663, %U A278854 4085772882929981162,112111211337670010640,2886455827088580869876,69931800720183748326477 %N A278854 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. %C A278854 Column 7 of A278855. %H A278854 R. H. Hardin, <a href="/A278854/b278854.txt">Table of n, a(n) for n = 1..83</a> %e A278854 Some solutions for n=2 %e A278854 ..1..0..1..1..1..1..0. .0..1..0..0..0..0..0. .0..1..1..0..1..1..1 %e A278854 ..1..0..0..0..0..1..1. .0..0..1..1..0..1..1. .1..0..1..0..1..0..0 %Y A278854 Cf. A278855. %K A278854 nonn %O A278854 1,1 %A A278854 _R. H. Hardin_, Nov 29 2016