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A194575
Number of lower triangles of an n X n 0..7 array with new values introduced in row major order 0..7 and no element equal to more than two horizontal or vertical neighbors
0
1, 5, 194, 110064, 1237399743, 230795314260831, 443383367826271457152, 7112925826561472131385895933
OFFSET
1,2
COMMENTS
Column 7 of A194576
EXAMPLE
Some solutions for 3X3
..0......0......0......0......0......0......0......0......0......0......0
..0.0....1.0....0.1....1.2....1.0....1.2....0.1....0.0....0.1....0.1....1.2
..1.1.1..2.2.0..2.2.1..1.1.0..1.1.2..1.1.2..2.3.1..1.2.0..0.1.2..1.0.1..2.2.1
CROSSREFS
Sequence in context: A068793 A194573 A194574 * A240772 A142927 A114351
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 29 2011
STATUS
approved