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 A278775 #4 Nov 28 2016 08:20:13 %S A278775 6,503,10784,150085,1673658,16205001,141166787,1126917480,8340736743, %T A278775 57745890265,376707516550,2329550843590,13722943412752,77304542920321, %U A278775 417679484040714,2169521229525151,10853156575543255,52367994237483811 %N A278775 Number of nX5 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. %C A278775 Column 5 of A278778. %H A278775 R. H. Hardin, <a href="/A278775/b278775.txt">Table of n, a(n) for n = 1..210</a> %H A278775 R. H. Hardin, <a href="/A278775/a278775.txt">Empirical polynomial of degree 69</a> %F A278775 Empirical polynomial of degree 69 (see link above) %e A278775 Some solutions for n=4 %e A278775 ..0..0..1..1..0. .0..1..0..0..0. .0..0..0..0..0. .0..1..0..1..1 %e A278775 ..1..1..1..1..1. .0..1..1..0..0. .0..0..0..0..1. .0..1..1..1..0 %e A278775 ..0..0..1..0..1. .1..1..0..1..0. .0..1..1..0..0. .1..0..0..0..1 %e A278775 ..1..0..0..0..0. .1..0..0..1..0. .1..1..1..1..1. .1..0..0..1..1 %Y A278775 Cf. A278778. %K A278775 nonn %O A278775 1,1 %A A278775 _R. H. Hardin_, Nov 28 2016