A231043 Number of n X n 0..3 arrays x(i,j) with each element horizontally, diagonally 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, 50, 2080, 344136, 448752816, 1729680196768, 24300980960474112, 1325427072324524913988

Offset

1,2

Comments

Diagonal of A231049

Links

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

Example

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

Crossrefs

Sequence in context: A367777 A088920 A278456 * A356611 A079198 A274485

Adjacent sequences: A231040 A231041 A231042 * A231044 A231045 A231046

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved