A201694 Number of n X n 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards

3, 10, 116, 4998, 930564, 795339012, 3262897246338

Offset

1,1

Comments

Diagonal of A201700

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A290557 A034945 A132480 * A336210 A244305 A074260

Adjacent sequences: A201691 A201692 A201693 * A201695 A201696 A201697

Keyword

nonn

Author

R. H. Hardin Dec 03 2011

Status

approved