A221553 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns

2, 71, 1930, 48018, 1200093, 29961271, 747830157, 18664821555, 465841969135, 11626559958154, 290177113520981, 7242272238158273, 180753392894785450, 4511261939241006332, 112592541470281392840, 2810096262246752615123

Offset

1,1

Comments

Row 3 of A221551

Links

R. H. Hardin, Table of n, a(n) for n = 1..85

Example

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

Crossrefs

Sequence in context: A202813 A081368 A221959 * A071871 A055030 A361688

Adjacent sequences: A221550 A221551 A221552 * A221554 A221555 A221556

Keyword

nonn

Author

R. H. Hardin Jan 19 2013

Status

approved