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%I #4 Nov 18 2016 06:43:08
%S 21,1492,51229,1548002,43798840,1133034160,26606146271,577253086055,
%T 11856994168275,234252250004719,4462457602929707,81437338008292870,
%U 1411665474225016752,23098384621606953307,355699829714059120732
%N Number of nX6 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
%C Column 6 of A278325.
%H R. H. Hardin, <a href="/A278323/b278323.txt">Table of n, a(n) for n = 1..150</a>
%e Some solutions for n=3
%e ..0..1..0..1..1..0. .0..1..0..1..0..1. .0..0..0..1..1..1. .0..1..0..1..1..1
%e ..1..0..1..0..1..1. .0..1..1..0..1..0. .0..1..1..1..1..1. .1..0..0..1..0..0
%e ..1..1..0..0..1..0. .1..0..1..1..0..1. .1..1..0..1..1..0. .1..0..0..1..0..1
%Y Cf. A278325.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 18 2016