A230519 Number of n X n 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

0, 12, 1408, 1787448, 19885757988, 1844551938024312, 1451215874840625764698, 9674666289037189459994106966

Offset

1,2

Comments

Diagonal of A230526

Links

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

Example

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

Crossrefs

Sequence in context: A004145 A296609 A171484 * A235535 A145835 A008992

Adjacent sequences: A230516 A230517 A230518 * A230520 A230521 A230522

Keyword

nonn

Author

R. H. Hardin, Oct 22 2013

Status

approved