OFFSET
1,1
COMMENTS
Column 4 of A261709.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-7) +5*a(n-10) +a(n-13) -a(n-14) -a(n-17) -2*a(n-21) for n>27.
EXAMPLE
Some solutions for n=7
..0..0..0..0..1..0....0..1..0..1..0..0....0..1..0..0..0..0....1..0..0..0..0..1
..0..0..0..1..0..0....1..0..0..0..0..0....0..0..0..0..0..1....0..1..0..0..1..0
..1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..1..0....1..0..0..0..0..0
..0..0..0..0..0..0....0..0..0..1..0..0....0..1..0..0..0..0....0..0..0..0..0..0
..0..0..0..1..0..0....0..0..1..0..0..0....1..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..1..0....0..0..1..0..0..0
..0..0..0..0..0..0....0..0..0..0..0..1....1..0..0..1..0..0....0..0..0..0..0..0
..0..0..0..0..0..1....0..0..1..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1
..0..1..0..0..1..0....0..1..0..0..0..1....0..0..0..0..0..0....1..0..1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 28 2015
STATUS
approved