OFFSET
1,1
COMMENTS
Row 7 of A207453.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 19*a(n-2) + 6*a(n-3) - 36*a(n-4).
Empirical g.f.: 14*x*(1 + 13*x + 6*x^2 - 36*x^3) / ((1 + 2*x - 4*x^2)*(1 - 3*x - 9*x^2)). - Colin Barker, Jun 23 2018
EXAMPLE
Some solutions for n=5:
0 1 0 1 0 1 0 1 1 0 1 1 0 1 0 1 1 0 1 1
0 1 1 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 1
0 1 0 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 1
0 1 0 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 0
0 1 0 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 0
0 1 0 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 0
0 1 0 1 0 0 1 0 1 0 0 1 0 1 1 1 0 1 0 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 17 2012
STATUS
approved