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A221789
Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns
1
0, 0, 1, 16, 173, 1325, 15936, 187794, 2167196, 25071259, 290320330, 3362811279, 38954814644, 451260930462, 5227519694115, 60556885619049, 701505602257606, 8126407466223744, 94138215587957627, 1090519135777805628
OFFSET
1,4
COMMENTS
Row 4 of A221787
LINKS
EXAMPLE
All solutions for n=3
..0..2..1
..1..2..0
..0..2..1
..1..2..0
CROSSREFS
Sequence in context: A200673 A230510 A238725 * A018209 A021174 A021374
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 25 2013
STATUS
approved