A188978 Number of nX4 array permutations with each element moved but moved no more than a city block distance of two.

4, 900, 295264, 54113236, 10523263424, 2184414516364, 446454227170968, 90637093836201284, 18447462299508458652, 3757678170703167716673, 765103415743509162801632, 155767055441358236289145024

Offset: 1

Author

R. H. Hardin Apr 14 2011

Keywords

• nonn

Comments

Column 4 of A188981

Examples

			Some solutions for 3X4
..2..4..0.11....2..3.10.11....1..6..3.11....2..4..7.11....2..3..0.11
..5..8..9..3....8..1..5..6....9..7..4..2....9.10..3..5....1..8..7..6
.10..1..7..6....0..4..7..9....0..8..5.10....0..1..8..6....9..4..5.10
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..52