1,2
Diagonal of A299661.
Table of n, a(n) for n=1..9.
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..1..0..1..0. .0..1..0..0..1. .0..0..0..0..0. .0..0..1..1..1
..1..0..1..1..1. .0..1..1..1..1. .0..0..1..0..0. .1..1..1..1..0
..0..0..0..1..1. .0..0..0..1..0. .1..1..1..0..1. .0..0..0..0..1
..1..0..0..0..0. .1..0..1..0..1. .0..1..0..0..1. .0..1..0..0..0
Cf. A299661.
Sequence in context: A193786 A213799 A316809 * A033508 A320365 A317559
Adjacent sequences: A299652 A299653 A299654 * A299656 A299657 A299658
nonn
R. H. Hardin, Feb 15 2018
approved