A194610 Half the number of lower triangles of an (n+1) X (n+1) 0..3 array with no element equal to the average of its horizontal and vertical neighbors.

16, 775, 132214, 86867366, 214726600125, 1988649454264015, 69098146174647014753, 9010212831798851496619501, 4408846076603948466494884939778

Offset: 1

Author

R. H. Hardin, Aug 30 2011

Keywords

• nonn

Comments

Column 3 of A194615.

Examples

			Some solutions for 3 X 3
..1......3......1......3......0......0......2......3......3......3......1
..2.1....0.1....2.1....1.0....2.3....2.0....0.0....2.1....0.3....2.0....0.3
..2.1.2..1.3.2..3.1.3..2.1.0..0.0.2..2.0.3..2.1.3..1.1.2..3.0.2..2.3.0..2.3.1
		

Crossrefs

Cf. A194615.