OFFSET
1,1
COMMENTS
Column 3 of A206871.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) + 8*a(n-3) + 4*a(n-4) - 2*a(n-5) - a(n-6).
Empirical g.f.: x*(7 + 21*x + 15*x^2 - 11*x^3 - 9*x^4 - x^5) / (1 - 4*x - 8*x^3 - 4*x^4 + 2*x^5 + x^6). - Colin Barker, Jun 17 2018
EXAMPLE
Some solutions for n=4:
0 1 0 1 1 1 0 1 1 1 1 0 0 1 0 0 1 1 0 0 1
1 0 1 1 1 0 1 1 0 0 0 1 1 0 0 0 1 1 0 0 1
0 0 1 1 0 0 1 1 0 0 0 1 1 0 1 0 1 1 1 1 1
0 1 0 1 0 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2012
STATUS
approved