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.

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

Table of n, a(n) for n=1..6.

Livio Zucca, PolyMultiForms

Livio Zucca, The 12 2-BiSquares (from the Zucca web site).

Crossrefs

Cf. A121196, A121197, A121198.

Sequence in context: A189548 A103759 A351526 * A189490 A180808 A004356

Adjacent sequences: A121192 A121193 A121194 * A121196 A121197 A121198

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 17 2006

Extensions

More terms from Don Reble, Aug 17 2007

Status

approved