A252931 Number of n X n nonnegative integer arrays with upper left 0 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.

1, 5, 44, 711, 17962, 578342, 21312696, 857248091, 36723156004, 1650365159314, 77015673357558, 3704833216794534, 182732875391479366, 9203662331845611018, 471886132793225715184, 24568007717042452684419, 1296265434331412271116602

Offset: 1

Author

R. H. Hardin, Dec 24 2014

Keywords

• nonn

Comments

Diagonal of A252938

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..24