OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..200
S. Butler and S. Osborne, Counting tilings by taking walks, 2012.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 27 2012
EXTENSIONS
More terms from Alois P. Heinz, Jun 06 2013
STATUS
approved