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A194534
Number of lower triangles of an n X n 0..2 array with new values introduced in row major order 0..2 and no element equal to more than one horizontal or vertical neighbor
0
1, 4, 59, 1851, 119548, 16039294, 4460214471, 2572187445993, 3075932897564028, 7627704068111688574, 39223874584658826539499, 418261269510360187893175534, 9248796169262343437995449320699, 424095060368117191810477243815045914
OFFSET
1,2
COMMENTS
Column 2 of A194540
EXAMPLE
Some solutions for 3X3
..0......0......0......0......0......0......0......0......0......0......0
..0.1....0.1....1.2....1.1....1.2....1.1....1.1....1.2....1.1....1.0....1.1
..2.0.0..1.0.0..0.2.0..2.0.0..2.1.2..0.2.1..2.2.1..0.1.0..2.0.2..1.2.0..0.2.0
CROSSREFS
Sequence in context: A198508 A126754 A264820 * A331712 A026586 A298064
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 28 2011
STATUS
approved