OFFSET
4,1
LINKS
T. Horiyama and M. Samejima, Enumeration of polyominoes for p4 tiling, 21st Canad. Conf. Comput. Geometry, CCCG 2009 (2009), Table 1.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. J. Mathar, Mar 11 2021
STATUS
approved