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

1,1

Comments

Column 6 of A278807.

Links

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

Example

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

Crossrefs

Cf. A278807.

Sequence in context: A309804 A236753 A269473 * A160141 A331476 A239408

Adjacent sequences: A278802 A278803 A278804 * A278806 A278807 A278808

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved