A278804 Number of n X 5 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order.

21, 336, 5767, 110455, 2179956, 41299256, 725674326, 11698232451, 172994405326, 2356249442222, 29713542257399, 348752692539813, 3828597575581476, 39486426123589674, 384123325152744838, 3537191225894230125

Offset

1,1

Comments

Column 5 of A278807.

Links

R. H. Hardin, Table of n, a(n) for n = 1..109

Example

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

Crossrefs

Cf. A278807.

Sequence in context: A036224 A113895 A062260 * A166914 A020311 A295350

Adjacent sequences: A278801 A278802 A278803 * A278805 A278806 A278807

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved