OFFSET
1,2
COMMENTS
Row 2 of A219410.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 3*a(n-2) + 6*a(n-3) - 3*a(n-4) + 4*a(n-5).
Empirical g.f.: x*(1 + 3*x + 3*x^2 + x^3 + 4*x^4) / ((1 - x + x^2)*(1 - 3*x - x^2 - 4*x^3)). - Colin Barker, Jul 26 2018
EXAMPLE
Some solutions for n=3:
..0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....1..0..0....1..1..1
..1..1..1....1..0..0....0..0..0....1..0..0....1..0..1....0..0..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2012
STATUS
approved