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A221197
Number of n X 4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.
1
4, 196, 9025, 427716, 20277009, 961434049, 45583531009, 2161117565476, 102456463038084, 4857310924636921, 230276948274214416, 10917021188851445889, 517556134069075087921, 24536386370101531606209
OFFSET
1,1
COMMENTS
Column 4 of A221200.
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1..1....0..2..2..0....2..2..0..0....0..2..2..1....0..0..2..0
..2..2..0..1....0..1..2..1....1..0..1..2....2..0..0..1....1..2..2..0
..1..2..2..0....0..1..2..1....0..1..2..1....1..2..1..0....0..2..1..2
CROSSREFS
Cf. A221200.
Sequence in context: A219163 A017546 A144044 * A180991 A279803 A209288
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2013
STATUS
approved