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 A278851 #4 Nov 29 2016 10:25:37 %S A278851 0,25,1348,30772,449677,4950399,44571591,344302564,2353207764, %T A278851 14536481606,82424606803,434031398793,2141802790067,9975624305928, %U A278851 44106878749240,186005545087412,751100286992318,2913746151722174 %N A278851 Number of nX4 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. %C A278851 Column 4 of A278855. %H A278851 R. H. Hardin, <a href="/A278851/b278851.txt">Table of n, a(n) for n = 1..210</a> %H A278851 R. H. Hardin, <a href="/A278851/a278851.txt">Empirical polynomial of degree 52</a> %F A278851 Empirical polynomial of degree 52 (see link above) %e A278851 Some solutions for n=4 %e A278851 ..1..0..1..0. .1..0..1..0. .1..0..0..1. .0..1..1..1. .0..0..0..1 %e A278851 ..1..0..0..0. .0..1..0..1. .0..0..1..0. .0..0..1..1. .1..1..1..1 %e A278851 ..1..1..0..1. .1..1..1..0. .0..0..1..1. .1..0..0..0. .1..0..1..1 %e A278851 ..0..1..1..1. .1..0..1..0. .1..1..0..0. .1..0..0..0. .1..1..1..0 %Y A278851 Cf. A278855. %K A278851 nonn %O A278851 1,2 %A A278851 _R. H. Hardin_, Nov 29 2016