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A221389
Number of 3 X n 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, 0, 4, 94, 1450, 20689, 284702, 3856027, 51806212, 693213401, 9256626752, 123474805622, 1646142914632, 21939928353674, 292375085482054, 3895949812693799, 51912242778609770, 691699897071467742
OFFSET
1,3
COMMENTS
Row 3 of A221388.
LINKS
EXAMPLE
All solutions for n=3
..0..2..1....0..2..1....0..2..0....0..2..1
..1..2..1....0..2..1....1..2..1....1..2..0
..0..2..0....1..2..0....1..2..0....1..2..0
CROSSREFS
Cf. A221388.
Sequence in context: A321221 A116291 A061992 * A220374 A220429 A210857
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2013
STATUS
approved