A230824 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 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero

0, 2, 8, 62, 898, 29446, 1807682, 188719562, 33264404940, 9945976161290

Offset

1,2

Comments

Diagonal of A230831

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A161566 A192516 A159476 * A006245 A202751 A227160

Adjacent sequences: A230821 A230822 A230823 * A230825 A230826 A230827

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved