A221924 Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.

13, 3487, 508281, 75313013, 11143187999, 1648683705320, 243924224883451, 36085841660921104, 5338383610734905950, 789733272292081157838

Offset: 1

Author

R. H. Hardin Jan 31 2013

Keywords

• nonn

Comments

Column 4 of A221925

Examples

			Some solutions for n=3
..0..0..0..1....0..2..1..3....0..4..0..3....0..1..2..0....0..3..0..1
..0..5..0..0....0..0..0..1....0..1..0..0....0..2..0..1....0..2..1..1
..1..3..0..2....2..1..1..1....0..3..1..0....1..0..3..2....3..0..1..0