1,2

Diagonal of A221139

Table of n, a(n) for n=1..6.

Some solutions for n=3

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

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

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

Sequence in context: A081232 A020548 A091062 * A015007 A054327 A209964

Adjacent sequences: A221130 A221131 A221132 * A221134 A221135 A221136

nonn

R. H. Hardin Jan 02 2013

approved