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 A278324 #4 Nov 18 2016 06:44:01 %S A278324 56,4991,251892,11947350,570738085,26606146271,1159826452573, %T A278324 46588303100299,1741053359883624,61687083048618477, %U A278324 2105403821298913363,69685735738121699248,2231675758500253736280,68674888544867993485304 %N A278324 Number of nX7 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes. %C A278324 Column 7 of A278325. %H A278324 R. H. Hardin, <a href="/A278324/b278324.txt">Table of n, a(n) for n = 1..79</a> %e A278324 Some solutions for n=2 %e A278324 ..1..0..1..1..0..0..0. .0..0..1..1..1..0..0. .0..0..1..1..1..1..0 %e A278324 ..1..1..0..1..1..1..1. .0..0..0..0..1..0..0. .1..1..1..0..0..0..0 %Y A278324 Cf. A278325. %K A278324 nonn %O A278324 1,1 %A A278324 _R. H. Hardin_, Nov 18 2016