A278774 Number of nX4 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

1, 117, 1972, 19750, 150085, 955347, 5355983, 27218249, 127644118, 559023840, 2305566900, 9009824325, 33520023813, 119176965881, 406212717567, 1330964850429, 4202125841615, 12811256626245, 37790376053439

Offset: 1

Author

R. H. Hardin, Nov 28 2016

Keywords

• nonn

Comments

Column 4 of A278778.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 36

Crossrefs

Cf. A278778.

Formula

Empirical polynomial of degree 36 (see link above)