OFFSET
1,1
COMMENTS
Column 3 of A261709.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-3) +3*a(n-6) +4*a(n-7) -2*a(n-9) +4*a(n-11) -8*a(n-13) +10*a(n-14) for n>20.
EXAMPLE
Some solutions for n=7
..0..0..0..0..1....1..0..0..0..0....1..0..1..0..0....1..0..0..0..0
..1..0..0..0..0....0..0..0..0..0....0..1..0..0..0....0..1..0..0..1
..1..1..0..0..1....1..0..0..1..0....0..0..0..0..0....1..0..0..0..0
..1..0..0..0..0....0..0..0..0..1....0..0..0..0..1....0..0..0..0..1
..0..0..0..0..1....0..0..0..0..0....1..0..0..1..0....1..0..0..1..0
..1..0..0..1..0....0..1..0..0..1....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....1..0..0..0..0....1..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..1..0....0..0..1..0..0
..0..1..0..0..1....1..0..0..1..0....0..0..0..0..1....0..1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 28 2015
STATUS
approved