A221823 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction

13, 2113, 190756, 18636989, 1804472268, 174820457922, 16936005698353, 1640717334488903, 158947987755078035, 15398437448141904936, 1491757378064714004413, 144517269678468770214198

Offset

1,1

Comments

Column 4 of A221824

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A196589 A197046 A283633 * A075601 A325216 A161588

Adjacent sequences: A221820 A221821 A221822 * A221824 A221825 A221826

Keyword

nonn

Author

R. H. Hardin Jan 26 2013

Status

approved