A265966 Number of n X n 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique.

5, 288, 6112, 74248, 631264, 5006296, 34825856, 249438952, 1579115104

Offset

1,1

Comments

Diagonal of A265973.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A265973.

Sequence in context: A276556 A283569 A252173 * A376465 A337540 A354962

Adjacent sequences: A265963 A265964 A265965 * A265967 A265968 A265969

Keyword

nonn

Author

R. H. Hardin, Dec 19 2015

Status

approved