OFFSET
1,1
COMMENTS
Column 3 of A207752.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 9*a(n-2) - 32*a(n-3) + 72*a(n-4) + 36*a(n-5) - 147*a(n-6) + 9*a(n-7) + 109*a(n-8) - 28*a(n-9) - 24*a(n-10) + 8*a(n-11) for n>12. Corrected by Colin Barker, Mar 06 2018
Empirical g.f.: 2*x*(3 - 3*x - 48*x^2 + 36*x^3 + 273*x^4 - 173*x^5 - 602*x^6 + 305*x^7 + 502*x^8 - 216*x^9 - 120*x^10 + 48*x^11) / ((1 - x)*(1 + x)*(1 - 2*x)*(1 - 3*x + x^2)*(1 + x - x^2)*(1 - x - x^2)*(1 - 2*x - 4*x^2)). - Colin Barker, Mar 06 2018
EXAMPLE
Some solutions for n=4:
..0..0..0....1..1..1....1..1..0....0..0..0....0..0..0....1..0..1....1..1..0
..1..1..1....1..1..1....0..1..0....1..0..1....0..1..0....1..0..1....1..0..1
..0..0..0....0..1..0....1..0..0....0..0..0....0..1..0....1..0..0....1..1..0
..1..1..1....1..1..1....0..1..0....1..0..1....0..0..0....1..0..1....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 19 2012
STATUS
approved