A266026 Number of n X n integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than itself.

1, 11, 481, 118489, 576560236, 16683384355551, 2672754315229290867, 4275997692282705369421209, 63037514242101405128726185634484, 6442860444936274078992907978523176224151

Offset

1,2

Comments

Diagonal of A266033.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Cf. A266033.

Sequence in context: A068235 A247598 A303207 * A156863 A145516 A041931

Adjacent sequences: A266023 A266024 A266025 * A266027 A266028 A266029

Keyword

nonn

Author

R. H. Hardin, Dec 20 2015

Status

approved