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A182070
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, diagonal or antidiagonal neighbor
0
1, 2, 35, 8292, 43324498, 7006657352045
OFFSET
1,2
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..0.1......1.2......1.2......1.2......1.2......1.2......1.2......0.1
..2.3.4....1.0.3....3.4.1....0.3.4....3.4.5....1.3.0....3.4.1....2.1.3
..1.3.4.2..1.4.1.4..2.4.5.3..1.3.1.2..5.4.5.2..4.3.1.2..5.0.1.5..0.1.2.0
CROSSREFS
Sequence in context: A132100 A327129 A291809 * A325630 A292702 A133013
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved