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 A278850 #4 Nov 29 2016 10:24:20 %S A278850 0,1,66,1348,15066,118158,731444,3813048,17413532,71497004,268726051, %T A278850 936836634,3059698312,9435007950,27642602449,77344108820,207567987387, %U A278850 536252189264,1337891704776,3232242731921,7579822554305,17290405684287 %N A278850 Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. %C A278850 Column 3 of A278855. %H A278850 R. H. Hardin, <a href="/A278850/b278850.txt">Table of n, a(n) for n = 1..210</a> %H A278850 R. H. Hardin, <a href="/A278850/a278850.txt">Empirical polynomial of degree 27</a> %F A278850 Empirical polynomial of degree 27 (see link above) %e A278850 Some solutions for n=4 %e A278850 ..1..0..0. .0..1..0. .1..1..0. .0..1..0. .0..1..1. .1..0..1. .0..1..0 %e A278850 ..0..0..1. .1..1..0. .0..1..0. .1..1..0. .0..1..0. .0..0..0. .1..0..0 %e A278850 ..1..0..0. .1..0..1. .1..0..1. .1..0..0. .0..0..0. .1..1..1. .0..1..0 %e A278850 ..0..1..1. .0..0..1. .0..0..1. .0..0..1. .0..1..0. .1..0..0. .0..0..1 %Y A278850 Cf. A278855. %K A278850 nonn %O A278850 1,3 %A A278850 _R. H. Hardin_, Nov 29 2016