A278805 Number of nX6 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order.

28, 672, 20972, 870473, 41299256, 1976588468, 89730161098, 3776527762052, 146582077597322, 5255148833158068, 174697385422916429, 5408652963998274118, 156617481905320805788, 4258375831859896074183, 109105728055490259454053

Offset: 1

Author

R. H. Hardin, Nov 28 2016

Keywords

• nonn

Comments

Column 6 of A278807.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..48

Crossrefs

Cf. A278807.