A201209 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.

4, 50, 1684, 146946, 33635880, 21062625664, 37432954261477

Offset: 1

Author

R. H. Hardin Nov 28 2011

Keywords

• nonn

Comments

Diagonal of A201216

Examples

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