A202806 Number of n X n nonnegative integer arrays with each row and column increasing from zero by 0, 1 or 2.

1, 3, 32, 1177, 146300, 60758779, 83834499040, 383108603365234, 5786835759666959842, 288547665952004154207686, 47452156644340908611972658594, 25719338921489550833572201554228792

Offset: 1

Author

R. H. Hardin Dec 24 2011

Keywords

• nonn

Comments

Diagonal of A202812

Examples

			Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..2....0..0..1..2
..0..0..0..0....0..0..0..2....0..0..2..2....0..1..2..2....0..0..1..3
..0..1..1..1....0..0..1..2....0..2..2..2....0..1..3..3....0..2..3..5