OFFSET
1,1
COMMENTS
Column 5 of A261553.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-7) -2*a(n-21) +a(n-28) for n>34
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0..0....0..0..0..0..0..1..1....0..0..0..0..0..1..0
..1..0..0..0..0..1..0....0..1..0..0..1..0..0....1..1..0..0..1..0..0
..0..1..0..0..1..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..0..0..0..0..0....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....1..0..0..1..0..0..1....0..1..0..0..1..0..0
..1..0..1..0..0..1..0....1..0..1..0..0..0..0....0..0..0..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 24 2015
STATUS
approved