OFFSET
1,1
COMMENTS
Column 3 of A206994.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 5*a(n-2) + 11*a(n-3) - 5*a(n-4) + a(n-5) - 3*a(n-6) + a(n-7) for n>9.
Empirical g.f.: x*(1 - x)*(7 + 35*x + 27*x^2 + 23*x^3 - 13*x^4 - 3*x^5 - x^6 + x^7) / (1 - 3*x - 5*x^2 - 11*x^3 + 5*x^4 - x^5 + 3*x^6 - x^7). - Colin Barker, Jun 17 2018
EXAMPLE
Some solutions for n=4:
1 0 1 0 0 1 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0
1 0 0 0 1 1 0 0 1 0 0 1 1 1 1 0 0 1 1 0 1
0 1 1 0 1 0 1 0 0 0 1 0 1 0 0 0 1 0 0 1 1
0 0 1 0 0 1 0 1 1 1 0 1 0 0 1 0 0 1 1 1 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2012
STATUS
approved