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 A278380 #4 Nov 20 2016 07:39:12 %S A278380 0,3,74,1220,12910,100807,652343,3750182,19784428,96786947,439906101, %T A278380 1859501560,7328752206,27039030100,93829708460,307762056698, %U A278380 958683800155,2848583303210,8105942966932,22169003715353,58456685214757 %N A278380 Number of nX3 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes. %C A278380 Column 3 of A278385. %H A278380 R. H. Hardin, <a href="/A278380/b278380.txt">Table of n, a(n) for n = 1..210</a> %H A278380 R. H. Hardin, <a href="/A278380/a278380.txt">Empirical polynomial of degree 31</a> %F A278380 Empirical polynomial of degree 31 (see link above) %e A278380 Some solutions for n=4 %e A278380 ..1..0..0. .0..0..0. .1..1..0. .1..1..1. .1..1..0. .1..0..0. .0..1..1 %e A278380 ..0..1..1. .1..0..0. .0..1..0. .1..1..0. .0..1..1. .0..0..0. .0..1..0 %e A278380 ..1..0..1. .0..1..0. .1..0..1. .0..1..0. .0..1..0. .0..1..0. .1..1..0 %e A278380 ..1..0..0. .0..1..0. .1..0..0. .0..1..0. .1..0..0. .1..0..1. .1..0..0 %Y A278380 Cf. A278385. %K A278380 nonn %O A278380 1,2 %A A278380 _R. H. Hardin_, Nov 20 2016