1,2

Superdiagonal 1 of A267278.

Table of n, a(n) for n=1..8.

Some solutions for n=4

..0..3..2..1..0....0..2..1..3..2....0..3..2..0..0....0..3..2..1..3

..2..1..0..3..1....2..1..3..1..0....2..1..0..3..1....3..1..0..2..1

..1..3..2..0..0....0..3..1..3..2....1..3..2..1..3....0..3..1..1..3

..2..2..3..3..1....2..0..3..1..0....2..2..0..3..1....2..0..0..2..2

Cf. A267278.

Sequence in context: A217322 A198700 A320094 * A015591 A078922 A199760

Adjacent sequences: A267277 A267278 A267279 * A267281 A267282 A267283

nonn

R. H. Hardin, Jan 12 2016

approved