A230463 Number of n X n 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, 0, 114, 76518, 281740616, 8449174734112, 1929668277796729476, 3350063281301654212261806

Offset

1,3

Comments

Diagonal of A230469.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A230469.

Sequence in context: A239654 A362797 A200577 * A200807 A084877 A060309

Adjacent sequences: A230460 A230461 A230462 * A230464 A230465 A230466

Keyword

nonn

Author

R. H. Hardin, Oct 20 2013

Status

approved