OFFSET
1,1
COMMENTS
Column 3 of A305040.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-3) for n>6
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .0..0..0
..0..0..0. .0..1..0. .0..1..0. .0..0..0. .1..0..1. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .0..1..0. .0..1..0. .1..1..1. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .0..0..0. .0..1..0. .1..0..1. .0..1..0. .0..1..0
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .1..1..0. .1..0..0. .0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 24 2018
STATUS
approved