A189347 Number of n X n array permutations with each element moving one space diagonally, horizontally or vertically.

0, 4, 48, 12592, 10252800, 64731638400, 2239546267804672, 494966160398383884544

Offset

1,2

Comments

Diagonal of A189355.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 3 X 3
..1..2..5....4..0..1....1..2..5....4..2..1....3..2..1....3..0..5....1..0..5
..0..8..4....6..3..2....7..0..8....0..5..8....4..0..8....6..1..2....6..8..2
..3..6..7....7..8..5....3..6..4....3..6..7....7..6..5....7..8..4....3..4..7

Crossrefs

Cf. A189355.

Sequence in context: A264265 A132510 A058311 * A248558 A372052 A198384

Adjacent sequences: A189344 A189345 A189346 * A189348 A189349 A189350

Keyword

nonn

Author

R. H. Hardin, Apr 20 2011

Status

approved