OFFSET
1,2
COMMENTS
Column 3 of A183312
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n)=2*a(n-1)+a(n-3).
Empirical G.f.: x*(1+x)^2/(1-2*x-x^3). [Colin Barker, Feb 23 2012]
EXAMPLE
Some solutions with a(1,1)=0 for 3X4
..0..1..0..1....0..0..1..1....0..1..0..1....0..1..0..0....0..1..1..0
..1..0..0..1....1..1..0..0....0..1..1..0....1..0..1..1....1..0..0..1
..0..1..1..0....0..1..0..1....1..0..1..0....0..1..0..0....0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved