A221778 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns

8, 258, 7676, 230621, 6911480, 207263892, 6215606652, 186396173357, 5589718833790, 167626605489419, 5026850431347057, 150747105072411113, 4520661588144287366, 135567321024902298286, 4065444442439149946284

Offset

1,1

Comments

Column 3 of A221780

Links

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

Example

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

Crossrefs

Sequence in context: A041487 A034988 A230271 * A172127 A230611 A230727

Adjacent sequences: A221775 A221776 A221777 * A221779 A221780 A221781

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved