OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 6*a(n-2) + 7*a(n-3) - 6*a(n-4) + 3*a(n-5) - a(n-6) - a(n-7) for n>8.
Empirical g.f.: x*(4 - 9*x + 11*x^2 - 12*x^3 + 8*x^4 - 3*x^5 - x^6 + x^7) / ((1 - x + x^2)*(1 - 3*x + 2*x^2 - 2*x^3 + 2*x^4 + x^5)). - Colin Barker, Oct 02 2018
EXAMPLE
Some solutions for n=7:
..1..1..1..1..0..0..0....1..1..1..0..0..0..1....0..0..0..0..0..1..0
..0..0..0..0..0..1..1....0..0..0..0..0..0..0....0..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2013
STATUS
approved