The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Nov 28 2016 08:22:35
%S 56,5209,189595,5355983,141166787,3634987413,90752836672,
%T 2155380363189,48042054699217,999491681597761,19416161058987737,
%U 353517442918850559,6065787121333416262,98680235108923294584,1531317900358396738494
%N Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.
%C Column 7 of A278778.
%H R. H. Hardin, <a href="/A278777/b278777.txt">Table of n, a(n) for n = 1..81</a>
%e Some solutions for n=3
%e ..1..0..1..1..0..0..0. .0..0..0..1..1..1..1. .1..1..0..0..1..0..0
%e ..1..0..0..0..1..0..0. .0..1..0..1..0..0..0. .0..0..1..0..0..1..0
%e ..1..0..0..0..1..0..0. .0..1..1..0..1..0..0. .1..1..0..1..0..0..1
%Y Cf. A278778.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 28 2016