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A182367
Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor
0
1, 3, 67, 21350, 147512732, 30761087800216
OFFSET
1,2
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.1......1.2......1.2......1.2......0.1......0.1
..1.2.1....3.3.4....2.3.4....0.3.0....0.3.3....3.2.3....0.2.2....2.3.4
..3.2.4.0..4.5.1.2..5.3.6.0..2.1.1.3..4.5.6.7..3.1.4.0..0.3.0.1..2.5.0.6
CROSSREFS
Sequence in context: A186208 A217625 A238316 * A091872 A079320 A283882
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved