1,1

Column 2 of A272973.

Table of n, a(n) for n=1..30.

Empirical: a(n) = a(n-1) +a(n-2) -a(n-3) for n>11

All solutions for n=3

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

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

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

Cf. A272973.

Sequence in context: A009325 A308346 A192390 * A067716 A125518 A083176

Adjacent sequences: A272964 A272965 A272966 * A272968 A272969 A272970

nonn

R. H. Hardin, May 11 2016

approved