A265214 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 three.

1, 16, 114, 17740, 959210, 30623109, 1704484254, 71709918479, 2699912810448, 303524301107151, 29867340328858563, 1936299753263097479, 229101723406443756560, 17759983927856012308427, 1168695064338719713271036

Offset

1,2

Comments

Column 3 of A265218.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..9..6....0..3..4....0..9..6....0..9.10....0..9.10....0..1..0....0..1..4
..9..0..9....1..4..7....3..6..7....9.10..1....3..6..7....1.10..1....3..4..5
.10..1.10....2..5..8....0..9.10....8..7.10....6..7..8....0..1.10....0..1..2
.11.10.11....1..2.11....9.10.11...11.10.11....7.10.11....1..2.11....1.10.11

Crossrefs

Cf. A265218.

Sequence in context: A081194 A121148 A091031 * A055994 A293876 A044348

Adjacent sequences: A265211 A265212 A265213 * A265215 A265216 A265217

Keyword

nonn

Author

R. H. Hardin, Dec 05 2015

Extensions

b-file extended from 55 to 210, R. H. Hardin, Dec 06 2015

Status

approved