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A221888 Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns 1
0, 37, 202, 4137, 56313, 760578, 10743570, 146119859, 2028893115, 27898424385, 385228380268, 5310170549668, 73246874081411, 1010094006938991, 13930674117586326, 192118828762920881, 2649549222526331807 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 21 10:41 EDT 2022. Contains 353908 sequences. (Running on oeis4.)