A265215 Number of (2n-1)X4 0..8n-5 arrays with upper left zero and lower right 8n-5 and each element differing from its horizontal and vertical neighbors by a power of three.

4, 17740, 361386063, 7949178726430, 453490948990318650, 41885608967085610717560, 2119003158795758114407105871, 127423261361014819748790685468801, 7872947094973478224838397154507741251

Offset

1,1

Comments

Column 4 of A265218 (nonzero terms).

Links

R. H. Hardin, Table of n, a(n) for n = 1..48

Example

Some solutions for n=2
..0..1.10..1....0..1..4..3....0..3..6..3....0..3..4..3....0..3..2..5
..9.10.11.10....1..2..5..2....9..6..5..2....3..0..1..2....1..2..5..2
.10..1.10.11....0..1..2.11....0..9..8.11....6..9.10.11....4..5..2.11

Crossrefs

Cf. A265218.

Sequence in context: A003832 A162703 A258101 * A070157 A003556 A331667

Adjacent sequences: A265212 A265213 A265214 * A265216 A265217 A265218

Keyword

nonn

Author

R. H. Hardin, Dec 05 2015

Extensions

Extended b-file from 14 to 48, correct b(14), R. H. Hardin, Dec 06 2015

Status

approved