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 A278853 #4 Nov 29 2016 10:27:29 %S A278853 1,1486,118158,4950399,154090507,4026240722,92891826961,1935392159582, %T A278853 36831668321915,644951602341507,10454319538089429,157736949429737228, %U A278853 2227039251935175027,29569631792451694669,370951068728197563294 %N A278853 Number of nX6 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. %C A278853 Column 6 of A278855. %H A278853 R. H. Hardin, <a href="/A278853/b278853.txt">Table of n, a(n) for n = 1..153</a> %e A278853 Some solutions for n=3 %e A278853 ..1..1..0..0..1..0. .0..1..1..1..0..1. .1..0..0..0..1..1. .0..0..0..0..0..1 %e A278853 ..0..0..0..1..1..0. .1..0..0..1..0..0. .1..1..1..0..1..0. .0..0..0..0..1..1 %e A278853 ..1..0..1..0..0..0. .1..1..0..1..1..0. .0..0..1..0..0..0. .1..0..0..1..0..1 %Y A278853 Cf. A278855. %K A278853 nonn %O A278853 1,2 %A A278853 _R. H. Hardin_, Nov 29 2016