OFFSET
1,1
COMMENTS
Column 5 of A305586.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-2) +12*a(n-3) -9*a(n-5) -27*a(n-6) for n>10
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..0..0. .0..0..1..1..0. .0..0..0..0..0. .1..0..1..1..1
..0..0..0..0..0. .0..0..0..0..0. .0..1..0..1..0. .1..1..1..1..1
..0..1..0..1..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..1..1..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 05 2018
STATUS
approved