A230268 Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 0, 28, 5734, 5524854, 28716109350, 810027275568580, 124090541934393885346

Offset

1,3

Comments

Diagonal of A230275

Links

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

Example

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

Crossrefs

Sequence in context: A131315 A200999 A221935 * A203328 A159407 A099058

Adjacent sequences: A230265 A230266 A230267 * A230269 A230270 A230271

Keyword

nonn

Author

R. H. Hardin, Oct 14 2013

Status

approved