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

1,2

Comments

Diagonal of A252938

Links

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

Example

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

Crossrefs

Sequence in context: A222059 A336290 A214396 * A229396 A301655 A048940

Adjacent sequences: A252928 A252929 A252930 * A252932 A252933 A252934

Keyword

nonn

Author

R. H. Hardin, Dec 24 2014

Status

approved