1,1

Diagonal of A283691.

Table of n, a(n) for n=1..11.

Some solutions for n=4

..1..0..1..0. .1..0..0..0. .0..0..0..1. .1..1..0..0. .0..0..1..0

..1..0..0..1. .0..1..0..1. .0..1..0..0. .1..1..0..0. .0..1..0..1

..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..0..0..1. .0..1..0..1

..1..0..1..0. .0..0..1..1. .0..0..0..0. .0..0..1..0. .1..0..0..0

Cf. A283691.

Sequence in context: A304317 A351918 A326272 * A197458 A050974 A012188

Adjacent sequences: A283682 A283683 A283684 * A283686 A283687 A283688

nonn

R. H. Hardin, Mar 14 2017

approved