A278629 Number of nX3 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

1, 285, 10824, 234484, 3739008, 48592635, 541463431, 5325263364, 47098291840, 379621129293, 2817194942225, 19407777240447, 124964309624036, 756392815286668, 4325156175914066, 23464134450391209, 121221027131246039

Offset: 1

Author

R. H. Hardin, Nov 24 2016

Keywords

• nonn

Comments

Column 3 of A278634.

Examples

			Some solutions for n=3
..1..2..1. .2..0..2. .1..0..2. .2..0..1. .2..0..0. .2..2..1. .0..1..0
..0..0..0. .0..2..0. .0..0..1. .0..2..1. .2..1..2. .2..1..2. .2..2..2
..1..1..0. .2..2..2. .1..0..1. .1..0..2. .2..0..0. .1..2..1. .1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 70

Crossrefs

Cf. A278634.

Formula

Empirical polynomial of degree 70 (see link above)