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A221820
Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
0
0, 40, 379, 29412, 854959, 35948127, 1290833232, 49447514716, 1844208808987, 69554410132666, 2610306743813999, 98167800387966673
OFFSET
1,2
COMMENTS
Row 4 of A221817
EXAMPLE
Some solutions for n=3
..1..2..1....1..1..0....1..2..0....0..2..0....1..3..1....1..0..0....0..2..1
..0..2..0....0..2..1....0..2..1....1..2..1....0..1..0....0..3..1....0..3..0
..0..1..0....1..3..0....1..1..1....0..1..1....1..2..0....1..3..0....2..3..1
..1..3..1....1..2..0....0..3..0....1..3..0....1..2..0....1..2..0....0..0..0
CROSSREFS
Sequence in context: A252180 A008355 A229716 * A301528 A253132 A293969
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 26 2013
STATUS
approved