A278318 Number of n X n 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

0, 3, 236, 19854, 3058990, 1133034160, 1159826452573, 3539023342110534, 33693644340398789900, 1032075934040317150939325

Offset: 1

Author

R. H. Hardin, Nov 18 2016

Keywords

• nonn

Comments

Diagonal of A278325.

Examples

			Some solutions for n=4
..0..1..0..0. .0..1..0..1. .0..0..1..0. .0..0..1..0. .0..0..1..1
..0..1..0..0. .1..0..0..1. .0..1..1..0. .0..0..0..0. .1..1..0..0
..0..0..1..1. .0..0..0..0. .1..0..1..0. .0..1..0..1. .1..1..0..1
..1..0..0..1. .0..1..0..0. .0..1..0..1. .1..0..0..1. .1..0..0..0
		

Crossrefs

Cf. A278325.