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A208297
Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors)
2
2, 42, 2906, 433252, 113503692, 46538017584, 27700815674032, 22702140562948192, 24626774613248937584, 34296243004533645925408, 59839415643338575851475744, 128222446504879248765189962560, 331858429902640216546970620625280
OFFSET
1,1
COMMENTS
Column 3 of A208301
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0....0..1..0....0..1..2....0..1..0....0..1..0....0..1..2....0..1..2
..0..1..0....0..1..0....0..1..2....0..1..0....2..3..0....0..3..1....0..3..0
..0..1..0....2..1..2....0..1..0....0..1..0....0..2..0....0..2..0....0..1..0
..0..2..1....0..1..0....0..1..0....0..1..0....0..1..0....3..1..0....0..3..0
CROSSREFS
Sequence in context: A216336 A152286 A293864 * A278150 A193271 A193272
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 25 2012
STATUS
approved