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A221812
Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns
1
1, 233, 3426, 197048, 5873327, 239116581, 8354914378, 314589265052, 11412369050409, 421725969587315, 15441431209200525, 567978925346570936, 20844338781073670408, 765835006795542240689, 28121494605427446146221
OFFSET
1,2
COMMENTS
Row 4 of A221809
LINKS
EXAMPLE
Some solutions for n=3
..1..0..1....0..2..2....1..1..2....2..1..1....0..3..0....0..2..0....1..2..1
..1..1..1....2..0..1....1..0..1....0..0..2....0..3..0....2..0..1....1..1..0
..1..2..0....0..1..0....0..1..1....1..2..0....1..1..1....2..2..1....2..1..0
..1..1..2....1..1..2....1..2..1....1..2..0....1..2..0....0..1..1....0..1..2
CROSSREFS
Sequence in context: A028474 A101218 A250464 * A219065 A301956 A220567
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 26 2013
STATUS
approved