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A182335
Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical or antidiagonal neighbor
0
1, 2, 27, 6097, 31863051, 5224775238844, 34790236871289428139
OFFSET
1,2
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.2......1.0......1.2......1.2......1.2......1.0
..0.1.3....3.1.0....3.0.1....2.3.4....3.4.1....0.1.3....3.4.1....2.3.4
..2.4.2.3..4.3.1.0..4.5.6.1..4.0.1.5..0.5.4.6..3.0.2.1..5.6.3.5..4.1.0.5
CROSSREFS
Sequence in context: A320669 A299116 A076113 * A362288 A056013 A363403
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 25 2012
STATUS
approved