OFFSET
1,2
COMMENTS
Column 3 of A240656
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +a(n-2) +2*a(n-3) -11*a(n-4) -12*a(n-5) -9*a(n-6) +15*a(n-7) +23*a(n-8) +20*a(n-9) -6*a(n-10) -15*a(n-11) -12*a(n-12) -2*a(n-13) +3*a(n-14) +a(n-15)
EXAMPLE
Some solutions for n=4
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..1
..0..0..0....1..0..1....0..1..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....0..0..0
..0..0..0....1..0..1....0..0..1....1..0..0....0..0..1....0..0..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
STATUS
approved