A250511 Number of (n+1) X (n+1) 0..3 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

120, 14660, 5941982, 9680713976, 59401819473382, 1474875409555370274, 144418186435193611803491, 57893463670928606700510218614, 93794026759277833253453343765668576

Offset

1,1

Comments

Diagonal of A250519.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Cf. A250519.

Sequence in context: A223992 A224023 A121012 * A151985 A229605 A268474

Adjacent sequences: A250508 A250509 A250510 * A250512 A250513 A250514

Keyword

nonn

Author

R. H. Hardin, Nov 24 2014

Status

approved