A183502 Number of n X n 0..3 arrays with no element equal to the sum mod 4 of its horizontal and vertical neighbors

3, 81, 19683, 43146816, 847298204784

Offset

1,1

Comments

Diagonal of A183508

Links

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

Example

Some solutions for 3X3
..2..2..3....1..2..2....2..3..0....0..3..1....3..0..2....3..1..0....2..1..3
..3..0..3....2..1..1....0..0..0....2..1..0....1..0..1....0..1..2....3..1..0
..2..1..1....1..2..1....0..2..3....0..3..1....3..1..1....2..3..3....3..2..1

Crossrefs

Sequence in context: A223570 A228971 A060722 * A325053 A134799 A055590

Adjacent sequences: A183499 A183500 A183501 * A183503 A183504 A183505

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved