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 A278384 #4 Nov 20 2016 07:43:15 %S A278384 8,5936,652343,50473056,3325788157,198563803019,11105331450864, %T A278384 586395701904408,29015321337746085,1335864857344408243, %U A278384 57236190892283185233,2296849324984530935992,87126825773953105905476 %N A278384 Number of nX7 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes. %C A278384 Column 7 of A278385. %H A278384 R. H. Hardin, <a href="/A278384/b278384.txt">Table of n, a(n) for n = 1..79</a> %e A278384 Some solutions for n=2 %e A278384 ..0..1..0..1..1..0..1. .1..0..1..1..1..1..1. .0..1..1..1..1..0..1 %e A278384 ..0..0..0..1..1..1..0. .0..0..1..1..0..0..0. .0..0..0..1..0..0..1 %Y A278384 Cf. A278385. %K A278384 nonn %O A278384 1,1 %A A278384 _R. H. Hardin_, Nov 20 2016