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

1,2

Comments

Diagonal of A202812

Links

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

Example

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

Crossrefs

Sequence in context: A283716 A352019 A355084 * A368601 A054780 A203323

Adjacent sequences: A202803 A202804 A202805 * A202807 A202808 A202809

Keyword

nonn

Author

R. H. Hardin Dec 24 2011

Status

approved