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A194891
Number of lower triangles of an n X n 0..6 array with new values introduced in row major order 0..6 and no two horizontal or vertical neighbors of any element equal
0
1, 3, 34, 5249, 7418424, 41521783200, 788547395813440
OFFSET
1,2
COMMENTS
Column 6 of A194893
EXAMPLE
Some solutions for 4X4
..0........0........0........0........0........0........0........0
..0.1......1.2......0.1......1.1......1.2......1.2......0.1......1.1
..2.2.3....1.3.4....2.3.0....2.3.0....1.3.0....3.3.4....2.3.0....2.3.4
..1.4.5.6..2.0.0.2..4.4.5.2..0.4.1.2..2.4.4.2..2.0.4.1..1.4.2.3..2.3.0.5
CROSSREFS
Sequence in context: A102104 A194890 A197434 * A194892 A182382 A222787
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 04 2011
STATUS
approved