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A265880
Number of nX3 arrays containing 3 copies of 0..n-1 with no element plus any horizontal neighbor equal to n-1.
0
0, 2, 152, 30488, 18437120, 13734486480, 21429982230720, 40229528835726720, 131323790370474455040
OFFSET
1,2
COMMENTS
Column 3 of A265882.
EXAMPLE
Some solutions for n=4
..3..1..3....3..1..1....2..0..2....3..1..3....3..1..0....1..3..1....3..2..0
..2..0..0....1..3..2....1..1..3....0..1..1....1..3..1....2..2..3....1..1..3
..3..1..1....2..0..0....0..0..2....3..2..0....0..2..3....0..1..0....0..0..2
..0..2..2....0..2..3....3..3..1....0..2..2....2..2..0....0..2..3....1..3..2
CROSSREFS
Cf. A265882.
Sequence in context: A113576 A102458 A206309 * A064436 A012605 A012602
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2015
STATUS
approved