OFFSET
1,1
COMMENTS
Column 3 of A206987.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + a(n-2) + 2*a(n-3) - a(n-4) - 2*a(n-5) for n>7.
Empirical g.f.: 2*x*(1 - x)*(3 + 15*x + 5*x^2 + 2*x^3 - 8*x^4 - 8*x^5) / (1 - 2*x - x^2 - 2*x^3 + x^4 + 2*x^5). - Colin Barker, Jun 17 2018
EXAMPLE
Some solutions for n=4:
1 0 0 0 0 0 1 0 0 0 0 1 0 1 1 0 1 1 1 1 0
1 1 1 1 0 0 1 0 0 1 1 1 0 0 0 0 0 1 0 0 0
1 1 1 1 0 0 1 1 0 1 1 1 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 0 0 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2012
STATUS
approved