A121196 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 tiles, each composed of a big square and an adjacent little square.

1, 11, 114, 1519, 20769

Offset

1,2

Comments

The Zucca web site calls these figures "n-PairSquares".

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..5.

Livio Zucca, PolyMultiForms

Crossrefs

Cf. A121195, A121197, A121198.

Sequence in context: A110799 A088089 A201966 * A251261 A332729 A160465

Adjacent sequences: A121193 A121194 A121195 * A121197 A121198 A121199

Keyword

nonn

Author

N. J. A. Sloane, Aug 17 2006

Extensions

Better definition from Don Reble, Aug 17 2007

Status

approved