A252830 Number of n X n nonnegative integer arrays with upper left 0 and every value within 2 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, 493, 6068, 78674, 1056756, 14564701, 204666202, 2919462498, 42143180174, 614251526864, 9024782449736, 133489812361806, 1985873221687284, 29689739907869581, 445797648515664064, 6719243690952576928

Offset

1,2

Comments

Diagonal of A252836

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

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

Crossrefs

Sequence in context: A343425 A054766 A369216 * A301434 A232192 A249791

Adjacent sequences: A252827 A252828 A252829 * A252831 A252832 A252833

Keyword

nonn

Author

R. H. Hardin, Dec 22 2014

Status

approved