OFFSET
1,1
COMMENTS
Column 3 of A208709.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1).
Empirical: a(n) = (A198480(n)+1)*2 = (A024075(n)+1)*4. [Martin Ettl, Nov 09 2012; revised Nov 13 2012]
EXAMPLE
Some solutions for n=4
..0..0..0....0..1..1....0..0..1....0..1..1....0..1..1....0..1..1....0..0..1
..1..0..1....1..0..1....0..0..1....0..1..1....1..0..0....1..0..1....0..1..1
..1..0..1....0..1..0....0..0..1....0..1..1....1..1..1....1..1..1....0..0..0
..1..0..1....0..1..0....1..1..1....0..1..1....1..0..1....1..0..1....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved