%I #4 Nov 25 2016 15:21:09
%S 56,1050,12727,134265,1378241,14437336,157706284,1809189550,
%T 21622163723,263667893290,3200723946503,37898709431669,
%U 431935945421546,4704720632893357,48828296440609470,482618940316582616
%N Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.
%C Column 7 of A278676.
%H R. H. Hardin, <a href="/A278675/b278675.txt">Table of n, a(n) for n = 1..81</a>
%e Some solutions for n=4
%e ..1..1..1..1..0..0..0. .1..0..0..0..0..0..0. .0..0..0..0..0..1..1
%e ..0..0..0..0..1..1..0. .1..1..1..1..1..1..0. .1..0..0..0..0..1..0
%e ..1..0..0..0..0..0..0. .0..1..0..0..0..0..0. .1..1..0..0..0..0..1
%e ..1..1..0..0..1..1..1. .0..1..1..1..1..0..1. .1..1..1..1..1..1..0
%Y Cf. A278676.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 25 2016