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

1,1

Comments

Column 3 of A194615.

Links

Table of n, a(n) for n=1..9.

Example

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.

Sequence in context: A042109 A221061 A326216 * A215171 A224736 A232519

Adjacent sequences: A194607 A194608 A194609 * A194611 A194612 A194613

Keyword

nonn

Author

R. H. Hardin, Aug 30 2011

Status

approved