1,2

Superdiagonal 4 of A267278.

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

Some solutions for n=3

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

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

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

Cf. A267278.

Sequence in context: A027816 A027823 A194718 * A289349 A023912 A027565

Adjacent sequences: A267280 A267281 A267282 * A267284 A267285 A267286

nonn

R. H. Hardin, Jan 12 2016

approved