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A232154
Number of n X n 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal
0
1, 18, 290, 7770, 382996, 36275078, 6564512068, 2246994465516, 1482101422338982, 1881388287368571956
OFFSET
1,2
COMMENTS
Diagonal of A232161
EXAMPLE
Some solutions for n=4
..3..2..0..3....0..1..3..2....2..1..3..2....1..2..3..2....3..0..2..1
..0..1..2..1....3..2..0..1....3..0..1..0....0..1..0..3....1..3..0..3
..3..0..3..2....1..3..2..3....1..3..2..1....2..3..2..1....2..1..2..1
..1..2..0..1....2..1..0..2....2..1..3..0....0..1..0..3....3..0..3..2
CROSSREFS
Sequence in context: A286725 A226998 A098303 * A014899 A048447 A167713
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2013
STATUS
approved