A221376 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2

17, 1035, 68006, 4616125, 318041768, 22033399959, 1529080824804, 106164820551146, 7371759230687250, 511872801045551424, 35542384488014253577, 2467887742431130823456, 171356388233296069988322

Offset

1,1

Comments

Column 4 of A221378

Links

R. H. Hardin, Table of n, a(n) for n = 1..45

Example

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

Crossrefs

Sequence in context: A221299 A258304 A221343 * A077645 A046731 A221268

Adjacent sequences: A221373 A221374 A221375 * A221377 A221378 A221379

Keyword

nonn

Author

R. H. Hardin Jan 13 2013

Status

approved