OFFSET
1,1
COMMENTS
Row 3 of A207960.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) + 7*a(n-3) + 4*a(n-4) - 7*a(n-6) - 6*a(n-7) + 6*a(n-9) + 2*a(n-10) - a(n-11) - a(n-12) for n>13.
Empirical g.f.: x*(6 + 30*x + 60*x^2 + 101*x^3 + 40*x^4 - 39*x^5 - 125*x^6 - 73*x^7 + 30*x^8 + 94*x^9 + 23*x^10 - 19*x^11 - 15*x^12) / ((1 + x^2 - x^3)*(1 - x - 2*x^2 - 5*x^3 - 3*x^4 + 3*x^5 + 5*x^6 - 2*x^8 - x^9)). - Colin Barker, Mar 06 2018
EXAMPLE
Some solutions for n=4:
..0..0..1..1....1..0..0..1....1..0..0..1....0..1..1..1....0..1..1..1
..0..0..1..0....1..1..1..1....0..1..0..0....1..1..1..0....1..1..1..1
..0..0..1..1....0..1..0..0....1..0..0..1....1..0..0..1....0..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2012
STATUS
approved