A265212 Number of nX1 0..n-1 arrays with upper left zero and lower right n-1 and each element differing from its horizontal and vertical neighbors by a power of three.

1, 1, 1, 4, 12, 32, 109, 366, 1189, 9855, 58994, 296022, 1959725, 11368311, 60437981, 345527448, 1904249259, 10390269667, 64901329419, 387065403450, 2241102587830, 13656975359566, 81191938320012, 473207108106993, 2804086644305202

Offset

1,4

Comments

Column 1 of A265218.

Links

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

Example

All solutions for n=4
..0....0....0....0
..3....1....1....3
..0....0....2....2
..3....3....3....3

Crossrefs

Cf. A265218.

Sequence in context: A120369 A001665 A066536 * A295500 A168078 A225894

Adjacent sequences: A265209 A265210 A265211 * A265213 A265214 A265215

Keyword

nonn

Author

R. H. Hardin, Dec 05 2015

Status

approved