A278850 Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

0, 1, 66, 1348, 15066, 118158, 731444, 3813048, 17413532, 71497004, 268726051, 936836634, 3059698312, 9435007950, 27642602449, 77344108820, 207567987387, 536252189264, 1337891704776, 3232242731921, 7579822554305, 17290405684287

Offset: 1

Author

R. H. Hardin, Nov 29 2016

Keywords

• nonn

Comments

Column 3 of A278855.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 27

Crossrefs

Cf. A278855.

Formula

Empirical polynomial of degree 27 (see link above)