A230609 Number of n X n 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

0, 0, 0, 348, 186396, 570014364, 8937075346246, 767293632652220616, 357373665302275132957038, 905088655807411194007179276150, 12460983434177387538182482340975091242

Offset

1,4

Comments

Diagonal of A230614

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..0..1..2..0....0..1..2..1....0..1..0..2....0..1..2..1....0..1..2..0
..0..1..1..2....2..0..0..2....2..0..1..0....2..0..1..2....0..2..1..0
..1..2..0..1....1..2..1..1....2..0..2..1....0..1..0..2....1..0..2..2
..1..0..2..1....2..0..2..1....0..1..0..2....2..0..1..0....0..1..0..2

Crossrefs

Sequence in context: A230616 A223178 A264326 * A177174 A139658 A181987

Adjacent sequences: A230606 A230607 A230608 * A230610 A230611 A230612

Keyword

nonn

Author

R. H. Hardin, Oct 25 2013

Status

approved