1,3
Diagonal of A300138.
Table of n, a(n) for n=1..10.
Some solutions for n=5
..0..0..1..0..1. .0..1..1..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..0. .1..1..1..0..0. .0..0..1..0..0. .0..0..0..0..0
..0..0..1..0..1. .0..1..1..1..1. .1..1..1..1..0. .0..0..1..0..1
..0..0..0..0..0. .1..1..1..1..1. .1..1..1..0..0. .0..0..0..0..0
..1..0..1..0..1. .0..1..0..1..0. .0..1..1..0..0. .1..0..0..0..1
Cf. A300138.
Sequence in context: A073396 A338093 A302553 * A101857 A350302 A184039
Adjacent sequences: A300129 A300130 A300131 * A300133 A300134 A300135
nonn
R. H. Hardin, Feb 26 2018
approved