OFFSET
1,1
COMMENTS
Column 1 of A205226
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +4*a(n-2).
Empirical g.f.: 4*x*(2+3*x)/(1-x-4*x^2). - R. J. Mathar, Jun 18 2013
EXAMPLE
Some solutions for n=4
..0..1....0..0....0..1....0..0....0..0....0..0....0..1....0..0....0..0....0..1
..1..1....1..0....1..0....1..0....0..0....1..0....1..1....1..1....0..0....0..1
..0..0....1..0....0..0....0..1....1..0....1..0....1..1....1..0....0..1....0..0
..1..0....1..1....1..1....1..1....1..0....0..0....0..0....0..1....1..0....0..0
..0..1....0..0....0..1....1..1....0..0....0..0....0..0....0..0....1..0....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 23 2012
STATUS
approved