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A221940
Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns
1
1, 489, 24535, 1759041, 119035112, 8118923949, 552777330287, 37650441405451, 2564181255574899, 174635497977344862, 11893675692936218866, 810026663520753630706, 55167419097633745309553, 3757214394165203187203557
OFFSET
1,2
COMMENTS
Row 4 of A221937
LINKS
EXAMPLE
Some solutions for n=3
..1..3..0....0..1..1....2..0..1....1..0..1....0..1..1....0..1..0....1..1..0
..0..0..1....3..0..1....1..0..0....1..3..0....3..0..1....2..3..0....1..4..0
..1..2..0....0..2..0....2..3..0....0..1..1....1..1..3....1..1..2....0..2..0
..2..1..1....2..1..1....1..1..1....2..1..1....0..1..0....1..0..1....0..2..1
CROSSREFS
Sequence in context: A214807 A251676 A230005 * A221739 A068751 A172951
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 01 2013
STATUS
approved