id:A121196 - OEIS Search Results

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Consider the tiling of the plane with squares of two different sizes as in Fig. 2.4.2(g) of Gruenbaum 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.

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1, 11, 114, 1519, 20769 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The Zucca web site calls these figures "n-PairSquares".`
	REFERENCES	`Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987.`
	LINKS	`Livio Zucca, PolyMultiForms`
	CROSSREFS	`Cf. A121195, A121197, A121198.` `Sequence in context: A048553 A110799 A088089 this_sequence A125446 A076554 A044724` `Adjacent sequences: A121193 A121194 A121195 this_sequence A121197 A121198 A121199`
	KEYWORD	`nonn`
	AUTHOR	`njas, Aug 17 2006`
	EXTENSIONS	`Better definition from Don Reble, Aug 17 2007`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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