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A221675
Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns
1
4, 139, 5741, 229150, 9062913, 357398390, 14082457465, 554737340774, 21850499916432, 860643590653662, 33898578158279334, 1335175267629518426, 52588965509249101477, 2071337262002534945067, 81584368108175368557177
OFFSET
1,1
COMMENTS
Column 4 of A221676
LINKS
EXAMPLE
Some solutions for n=3
..1..0..1..1....1..2..3..1....1..1..1..1....0..1..3..1....2..1..0..1
..2..1..0..2....1..0..0..0....0..1..2..1....1..0..1..0....2..1..1..2
..0..1..1..2....1..0..1..2....0..1..2..1....2..1..1..1....1..1..0..0
CROSSREFS
Sequence in context: A089666 A363114 A029850 * A340838 A291450 A093981
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2013
STATUS
approved