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A221384
Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2
1
0, 7, 94, 1198, 15181, 191832, 2420113, 30504742, 384323166, 4840824840, 60965809190, 767757426068, 9668215933583, 121747651964992, 1533100467093783, 19305382814565606, 243100053770292709, 3061195602161506408
OFFSET
1,2
COMMENTS
Column 4 of A221388
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2..0....0..2..2..1....0..2..2..0....0..2..2..1....0..1..1..1
..0..2..1..1....1..2..2..1....0..2..2..0....0..1..2..1....0..1..2..1
..1..2..2..0....0..0..1..0....1..2..1..0....1..1..1..0....1..2..2..0
CROSSREFS
Sequence in context: A134113 A071584 A132114 * A243679 A367162 A360474
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2013
STATUS
approved