A278777 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

56, 5209, 189595, 5355983, 141166787, 3634987413, 90752836672, 2155380363189, 48042054699217, 999491681597761, 19416161058987737, 353517442918850559, 6065787121333416262, 98680235108923294584, 1531317900358396738494

Offset: 1

Author

R. H. Hardin, Nov 28 2016

Keywords

• nonn

Comments

Column 7 of A278778.

Examples

			Some solutions for n=3
..1..0..1..1..0..0..0. .0..0..0..1..1..1..1. .1..1..0..0..1..0..0
..1..0..0..0..1..0..0. .0..1..0..1..0..0..0. .0..0..1..0..0..1..0
..1..0..0..0..1..0..0. .0..1..1..0..1..0..0. .1..1..0..1..0..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..81

Crossrefs

Cf. A278778.