

A221872


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


0




OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



