OFFSET
1,1
COMMENTS
Column 4 of A207500
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) -11*a(n-2) -92*a(n-3) +184*a(n-4) +391*a(n-5) -806*a(n-6) -893*a(n-7) +1570*a(n-8) +1170*a(n-9) -1486*a(n-10) -867*a(n-11) +679*a(n-12) +340*a(n-13) -139*a(n-14) -62*a(n-15) +10*a(n-16) +4*a(n-17) for n>18
EXAMPLE
Some solutions for n=4
..0..0..1..0....1..1..0..1....1..0..1..0....0..1..0..0....1..1..0..1
..1..0..1..0....1..1..0..1....0..0..1..0....0..0..1..0....0..1..0..0
..0..0..1..0....0..1..0..0....1..0..1..0....0..1..0..0....1..1..0..1
..1..0..1..0....1..0..0..1....0..0..1..0....0..0..1..0....0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 18 2012
STATUS
approved