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A267071
Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0.
0
1, 0, 6, 1129, 437427, 310439601, 368078731163, 672850064250832, 1794103196444632314
OFFSET
1,3
COMMENTS
Column 3 of A267072.
EXAMPLE
Some solutions for n=4
..0..0..2....0..2..2....0..2..0....0..2..1....0..0..3....0..3..3....0..0..2
..0..3..1....2..0..3....3..2..2....2..2..1....2..0..2....1..1..3....1..3..1
..3..1..1....0..3..1....0..3..1....0..3..3....1..3..2....2..0..2....3..2..1
..3..2..2....1..1..3....1..1..3....1..0..3....1..3..1....1..0..2....3..2..0
CROSSREFS
Cf. A267072.
Sequence in context: A179853 A268043 A190351 * A219165 A185537 A113159
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2016
STATUS
approved