A221398 Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2

0, 56, 2110, 89173, 3658806, 149231797, 6054851040, 244978992940, 9895703526545, 399360021773713, 16108509055841956, 649556971613873720, 26188220092197924807, 1055730681220332762888, 42557554894233839425159

Offset

1,2

Comments

Column 4 of A221400

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A004387 A111597 A111781 * A280803 A124101 A198948

Adjacent sequences: A221395 A221396 A221397 * A221399 A221400 A221401

Keyword

nonn

Author

R. H. Hardin Jan 15 2013

Status

approved