OFFSET
1,1
COMMENTS
The Zucca web site calls these figures "n-DifferentSquares".
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987.
LINKS
Livio Zucca, PolyMultiForms
CROSSREFS
KEYWORD
nonn,nice,hard,more
AUTHOR
N. J. A. Sloane, Aug 17 2006
EXTENSIONS
More terms from Don Reble, Aug 17 2007
a(13) from Joseph Myers, Oct 06 2011
STATUS
approved