A221299 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with no occupancy greater than 2

17, 1001, 63285, 4119299, 270434991, 17788952657, 1170461488239, 77011254247993, 5066792859597385, 333350527345443633, 21931251172817255263, 1442854892820284178311, 94924922041346379554607

Offset

1,1

Comments

Column 4 of A221303

Links

R. H. Hardin, Table of n, a(n) for n = 1..101

Example

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

Crossrefs

Sequence in context: A166188 A274548 A266860 * A258304 A221343 A221376

Adjacent sequences: A221296 A221297 A221298 * A221300 A221301 A221302

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved