A183820 1/256 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

1, 813, 8538066, 1163575148283, 2051388696859571241

Offset

1,2

Comments

Diagonal of A183827

Links

Table of n, a(n) for n=1..5.

Example

Some solutions with upper left block zero for 3X3
..0..0..1....0..0..3....0..0..1....0..0..0....0..0..3....0..0..1....0..0..3
..0..0..0....0..0..3....0..0..0....0..0..3....0..0..2....0..0..3....0..0..3
..1..1..3....2..1..1....0..2..1....2..1..0....2..2..2....0..2..1....1..3..1

Crossrefs

Sequence in context: A158667 A035854 A099116 * A272606 A235976 A015159

Adjacent sequences: A183817 A183818 A183819 * A183821 A183822 A183823

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved