A221779 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns

21, 2631, 311500, 36959565, 4383899151, 519828193272, 61646570104772, 7310747898489930, 866987511530643810, 102816641533831938240, 12193094561710087236373, 1445987266172531006933514

Offset

1,1

Comments

Column 4 of A221780

Links

R. H. Hardin, Table of n, a(n) for n = 1..54

Example

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

Crossrefs

Sequence in context: A144853 A131314 A225686 * A122801 A099680 A352086

Adjacent sequences: A221776 A221777 A221778 * A221780 A221781 A221782

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved