A250537 Number of (n+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction

150, 10704, 644779, 27240292, 824599694, 19031828420, 355022719767, 5607306662836

Offset

1,1

Comments

Diagonal of A250544

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A185406 A289309 A337032 * A264065 A264324 A145631

Adjacent sequences: A250534 A250535 A250536 * A250538 A250539 A250540

Keyword

nonn

Author

R. H. Hardin, Nov 24 2014

Status

approved