A189246 Number of n X n array permutations with each element making zero or one king moves

1, 24, 2961, 7396009, 194762146816, 71437033921822425, 330453235652954061843137, 20019535342827950668977079681024

Offset

1,2

Comments

Diagonal of A189254

Links

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

Example

Some solutions for 3X3
..4..2..5....3..1..4....4..0..1....0..3..4....0..2..1....0..2..4....0..1..2
..0..1..7....0..2..7....3..7..2....1..8..2....4..8..7....6..7..1....6..8..5
..6..3..8....6..5..8....6..8..5....6..7..5....3..6..5....3..5..8....3..4..7

Crossrefs

Sequence in context: A090444 A205795 A222852 * A001512 A217574 A272179

Adjacent sequences: A189243 A189244 A189245 * A189247 A189248 A189249

Keyword

nonn

Author

R. H. Hardin Apr 19 2011

Status

approved