A230468 Number of nX7 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 6912, 8724560, 5660619846, 3934875952932, 2758566554003680, 1929668277796729476, 1350140379793882468662, 944662799753269088092792, 660957923175167342980769708, 462456588637397425299120042326

Offset

1,2

Comments

Column 7 of A230469

Links

R. H. Hardin, Table of n, a(n) for n = 1..43

Example

Some solutions for n=3
..0..0..2..1..1..0..0....0..0..2..0..0..1..0....0..0..2..1..1..1..2
..0..1..1..2..2..1..1....0..1..1..2..2..2..1....0..1..1..2..1..0..0
..0..0..1..0..0..2..1....0..0..0..0..0..1..1....0..0..1..2..0..1..2

Crossrefs

Sequence in context: A268908 A192077 A272913 * A186059 A253612 A004243

Adjacent sequences: A230465 A230466 A230467 * A230469 A230470 A230471

Keyword

nonn

Author

R. H. Hardin, Oct 20 2013

Status

approved