OFFSET
1,1
COMMENTS
Column 4 of A261292.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) -2*a(n-2) +6*a(n-3) -a(n-4) +4*a(n-5) +a(n-6) -2*a(n-8) +2*a(n-9) -2*a(n-10) -4*a(n-11) -9*a(n-12) +4*a(n-13) -6*a(n-14) -2*a(n-16) -a(n-19) +3*a(n-20) -3*a(n-21) -a(n-24) for n>28
EXAMPLE
Some solutions for n=4
..0..1..0..1..0..1....0..0..1..0..1..0....0..1..0..1..0..1....0..1..0..1..0..1
..0..0..1..0..1..0....0..1..0..1..0..1....0..0..1..0..1..0....1..0..0..0..1..0
..0..1..0..0..0..1....1..0..1..0..1..0....0..1..0..1..0..1....0..1..0..1..0..1
..1..0..1..0..1..0....0..1..0..1..0..0....1..0..1..0..1..0....1..0..1..0..1..0
..0..1..0..1..0..1....1..0..1..0..1..0....0..1..0..1..0..1....0..0..0..1..0..1
..0..0..1..0..1..0....0..1..0..1..0..1....1..0..1..0..1..0....0..0..1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 14 2015
STATUS
approved