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