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A221232
Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2
1
4, 852, 54075, 3618339, 245539157, 16783348483, 1149649557942, 78781028973610, 5398115263510454, 369826510764450212, 25333832048380716784, 1735268265292767301022, 118852327360929428638771
OFFSET
1,1
COMMENTS
Column 4 of A221234
LINKS
EXAMPLE
Some solutions for n=3
..1..0..0..1....1..1..2..0....1..1..2..1....1..2..1..0....2..0..1..2
..2..1..1..2....2..1..0..2....0..2..1..0....1..0..2..1....1..0..1..2
..1..2..0..1....0..0..2..1....0..1..1..2....0..2..2..0....1..2..0..0
CROSSREFS
Sequence in context: A349067 A176186 A332184 * A272167 A255269 A113896
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 05 2013
STATUS
approved