A278803 Number of n X 4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order.

15, 154, 1439, 12958, 110455, 870473, 6275546, 41370842, 250517485, 1402100369, 7299678838, 35565305995, 163045228099, 706720556002, 2908736101561, 11411036414661, 42812862296055, 154084456853488, 533397095123831

Offset: 1

Author

R. H. Hardin, Nov 28 2016

Keywords

• nonn

Comments

Column 4 of A278807.

Examples

			Some solutions for n=4
..2..1..1..0. .2..1..1..0. .1..1..1..0. .1..1..0..0. .1..0..0..0
..2..1..1..0. .2..2..1..0. .2..0..0..1. .2..0..0..0. .1..2..2..0
..2..1..1..0. .2..2..1..2. .2..2..0..1. .2..0..1..1. .2..2..0..0
..2..2..1..1. .2..2..2..1. .2..2..2..1. .2..2..1..1. .2..2..2..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 44

Crossrefs

Cf. A278807.

Formula

Empirical polynomial of degree 44 (see link above).