A221888 Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns

0, 37, 202, 4137, 56313, 760578, 10743570, 146119859, 2028893115, 27898424385, 385228380268, 5310170549668, 73246874081411, 1010094006938991, 13930674117586326, 192118828762920881, 2649549222526331807

Offset

1,2

Comments

Column 4 of A221890

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Sequence in context: A211745 A211754 A211765 * A156569 A141984 A327033

Adjacent sequences: A221885 A221886 A221887 * A221889 A221890 A221891

Keyword

nonn

Author

R. H. Hardin Jan 30 2013

Status

approved