OFFSET
1,2
COMMENTS
Row 7 of A281056.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) -12*a(n-2) +5*a(n-3) +12*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) -a(n-9) for n>20
EXAMPLE
Some solutions for n=4
..0..1..1..0. .0..1..1..0. .0..1..0..1. .0..0..0..1. .0..1..0..1
..0..0..1..0. .1..0..1..0. .0..1..1..0. .1..1..0..1. .0..1..0..1
..1..1..0..1. .1..0..1..0. .0..1..0..1. .0..1..0..1. .0..1..0..0
..0..1..0..1. .0..1..0..1. .0..1..0..0. .0..1..0..1. .0..1..1..0
..1..0..1..0. .0..1..0..1. .1..0..1..1. .0..1..0..0. .0..0..1..0
..1..0..1..0. .1..0..0..1. .1..0..0..1. .1..0..1..1. .1..0..1..0
..0..0..1..0. .0..1..0..1. .1..1..0..1. .1..0..0..1. .1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2017
STATUS
approved