OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..87
FORMULA
Empirical: a(n) = a(n-1) + 2*a(n-2) - a(n-3) - a(n-4) - a(n-5) - a(n-6) + 2*a(n-8) + 2*a(n-9) - a(n-11) - a(n-12) - a(n-13) - a(n-14) + 2*a(n-15) + a(n-16) -a(n-17).
Empirical g.f.: x*(5 + 7*x - 2*x^2 - 4*x^3 - 6*x^4 - 3*x^5 + x^6 + 9*x^7 + 12*x^8 + 2*x^9 -6*x^10 - 4*x^11 - 6*x^12 - 5*x^13 + 9*x^14 + 6*x^15 - 5*x^16) / ((1 - x)^6*(1 + x)^3*(1 + x^2)*(1 + x + x^2)*(1 + x + x^2 + x^3 + x^4)). - Colin Barker, Jan 10 2019
EXAMPLE
Some solutions for n=4:
..0..0..1..1....0..0..0..1....0..0..1..1....0..0..0..0....0..0..0..1
..1..1..0..1....0..0..1..0....1..1..0..1....0..0..0..0....0..0..1..1
..1..1..1..0....1..1..0..0....1..1..1..0....1..1..1..1....1..1..0..0
..1..1..1..0....1..1..1..0....1..1..1..1....1..1..1..1....1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2016
STATUS
approved