A230330 Number of n X n 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 6, 534, 438284, 2788320240, 137077642883940, 52211092034409972862, 154024647784870223714406548, 3519277849947878097413487571658476

Offset

1,2

Comments

Diagonal of A230337

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A000411 A180431 A202967 * A252174 A251697 A173789

Adjacent sequences: A230327 A230328 A230329 * A230331 A230332 A230333

Keyword

nonn

Author

R. H. Hardin, Oct 16 2013

Status

approved