A229770 Number of n X n 0..2 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.

3, 22, 322, 12958, 2179956, 1976588468, 10811999412826, 378274896023686216, 88035611475274172311886, 140618374201747733896872001960

Offset: 1

Author

R. H. Hardin, Sep 29 2013

Keywords

• nonn

Comments

Column 2 of A229774

Examples

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