A265175 Number of nX3 0..n*3-1 arrays with upper left zero and lower right n*3-1 and each element differing from its horizontal and vertical neighbors by a power of two.

1, 21, 2024, 170970, 7796840, 1346956387, 226158945148, 16064538255326, 2727481849960472, 241831690436276658, 46326258129266431511, 5463137744818812207086, 939106595874317262360608

Offset

1,2

Comments

Column 3 of A265178.

Links

R. H. Hardin, Table of n, a(n) for n = 1..194

Example

Some solutions for n=4
..0..2..3....0..1..0....0..4..3....0..8..6....0..2..6....0..4..5....0..1..2
..2..3..7....1..3..1....8..6..5....8..6..2....2..3..5....8..6..4....4..5..1
..4..5..9....3.11..3....9..5..7....4..8.10....6..7..3....9..7..3....3..7..3
..2..3.11....2..3.11....8..7.11....5..9.11....7..3.11....8..9.11....2..3.11

Crossrefs

Cf. A265178.

Sequence in context: A358803 A243685 A221122 * A300577 A304643 A153848

Adjacent sequences: A265172 A265173 A265174 * A265176 A265177 A265178

Keyword

nonn

Author

R. H. Hardin, Dec 03 2015

Status

approved