A201270 Number of n X n 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

3, 5, 7, 85, 556, 1260, 27008, 215577, 613916, 16442049, 152673459, 487975060, 14392411292, 144918917509, 496264541787, 15559415313705, 165127072154120, 592098075114238

Offset

1,1

Comments

Diagonal of A201277

Links

Table of n, a(n) for n=1..18.

Example

Some solutions for n=5
..0..0..0..0..2....0..0..0..0..2....0..0..0..0..0....0..0..0..0..0
..0..0..1..2..2....0..0..1..1..2....0..0..0..1..1....0..0..1..2..2
..0..1..1..2..2....0..1..1..2..2....1..1..1..1..1....0..1..1..2..2
..0..1..1..2..2....0..1..1..2..2....1..2..2..2..2....1..1..1..2..2
..1..1..1..2..2....1..1..1..2..2....2..2..2..2..2....1..1..1..2..2

Crossrefs

Sequence in context: A306573 A254925 A153138 * A160360 A082697 A051345

Adjacent sequences: A201267 A201268 A201269 * A201271 A201272 A201273

Keyword

nonn

Author

R. H. Hardin Nov 29 2011

Status

approved