A252977 Number of n X n nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down.

0, 0, 1, 68, 4657, 432842, 60650883, 13458882036, 4857082197177, 2895119784219358, 2877300288177184239, 4796057029604523514392, 13457301734652492685623300, 63707500883584152928303777296

Offset: 1

Author

R. H. Hardin, Dec 25 2014

Keywords

• nonn

Comments

Diagonal of A252983

Examples

			Some solutions for n=4
..0..0..0..1....0..0..0..0....0..0..0..1....0..0..0..0....0..0..1..1
..0..0..0..1....0..0..0..1....1..1..1..1....0..0..0..0....0..0..1..1
..0..1..1..1....0..0..1..1....1..1..1..1....0..0..0..0....0..1..1..1
..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15