A221696 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction

1, 987, 63676, 7033429, 659020617, 64509677154, 6233675847228, 604346923784252, 58538232535028520, 5671250113728678882, 549411330594167686392, 53225495837252796349285, 5156336905625087231654148

Offset

1,2

Comments

Row 4 of A221693

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

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

Crossrefs

Sequence in context: A248352 A072316 A222351 * A221128 A045733 A250490

Adjacent sequences: A221693 A221694 A221695 * A221697 A221698 A221699

Keyword

nonn

Author

R. H. Hardin Jan 22 2013

Status

approved