A188810 Number of nX2 array permutations with each element moved but remaining in its original row or its original column

1, 4, 20, 272, 6032, 205312, 9672448, 601903360, 47722897664, 4692633242624

Offset

1,2

Comments

Column 2 of A188813

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 3X2
..2..5....4..5....4..3....1..0....4..5....2..5....2..0....4..3....1..0....1..0
..3..1....0..1....0..2....4..5....3..2....4..1....3..1....0..5....3..2....4..2
..0..4....2..3....5..1....2..3....0..1....0..3....5..4....2..1....5..4....5..3

Crossrefs

Sequence in context: A352412 A222655 A000847 * A120443 A053400 A362259

Adjacent sequences: A188807 A188808 A188809 * A188811 A188812 A188813

Keyword

nonn

Author

R. H. Hardin Apr 11 2011

Status

approved