1,2

Diagonal of A268904.

R. H. Hardin, Table of n, a(n) for n = 1..15

Some solutions for n=4

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

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

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

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

Cf. A268904.

Sequence in context: A099366 A095657 A209014 * A034996 A166770 A270602

Adjacent sequences: A268894 A268895 A268896 * A268898 A268899 A268900

nonn

R. H. Hardin, Feb 15 2016

approved