A230903 Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

0, 2, 38, 802, 30304, 2121666, 271505344, 63341237848, 26993178279216

Offset

1,2

Comments

Diagonal of A230910

Links

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

Example

Some solutions for n=4
..0..2..0..3....0..3..1..3....0..2..1..3....0..1..2..1....0..1..0..1
..1..3..1..0....1..2..0..1....1..3..0..1....3..0..3..0....2..3..2..0
..0..2..3..2....3..1..3..2....2..1..2..0....1..2..1..2....0..1..3..2
..1..0..1..0....0..2..1..0....0..3..1..3....3..0..3..1....3..2..1..0

Crossrefs

Sequence in context: A262585 A208240 A075796 * A246000 A266601 A266597

Adjacent sequences: A230900 A230901 A230902 * A230904 A230905 A230906

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved