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A121195
Consider the tiling of the plane with squares of two different sizes as in Fig. 2.4.2(g) of Grünbaum and Shephard, p. 74. a(n) is the number of connected figures that can be formed on this tiling, from n big squares and n small squares.
4
1, 12, 152, 2538, 45084, 851717
OFFSET
1,2
COMMENTS
The Zucca web site calls these figures "n-BiSquares".
REFERENCES
Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987.
LINKS
Livio Zucca, PolyMultiForms
Livio Zucca, The 12 2-BiSquares (from the Zucca web site).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Aug 17 2006
EXTENSIONS
More terms from Don Reble, Aug 17 2007
STATUS
approved