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A221612
Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns
1
0, 8, 287, 12270, 472974, 18561474, 730077217, 28767381806, 1133353855049, 44645624030182, 1758539674266383, 69265063373736612, 2728173710022769575, 107455513583959689740, 4232383298478054347329, 166702136284618558999914
OFFSET
1,2
COMMENTS
Row 4 of A221609
LINKS
EXAMPLE
Some solutions for n=3
..0..2..0....0..1..1....0..2..1....1..2..0....0..2..1....1..2..0....0..2..1
..1..2..0....0..3..1....0..2..0....0..2..0....0..2..0....0..2..1....0..2..1
..1..2..0....1..2..1....2..2..0....2..2..0....1..2..0....0..1..1....0..3..1
..2..2..0....0..2..0....0..2..1....0..2..1....2..2..0....1..3..0....0..1..1
CROSSREFS
Sequence in context: A247484 A136364 A089670 * A348122 A060355 A060859
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 20 2013
STATUS
approved