1,2

Table of n, a(n) for n=1..12.

Some solutions for n=4

..2..0..1..0....2..2..2..1....2..0..2..0....2..1..0..0....0..1..2..0

..0..2..0..2....2..0..2..2....0..2..0..2....1..2..0..0....1..2..0..2

..1..0..1..1....2..2..0..2....2..0..2..1....0..0..0..1....2..0..1..0

..0..2..1..1....1..2..2..2....0..2..1..2....0..0..1..0....0..2..0..1

Sequence in context: A226554 A211037 A130607 * A086345 A295545 A309534

Adjacent sequences: A211039 A211040 A211041 * A211043 A211044 A211045

nonn

R. H. Hardin Mar 30 2012

approved