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A057973 Number of polybricks: number of ways to arrange n 1 X 2 "bricks" in a wall (see illustrations). 10
1, 2, 5, 16, 55, 225, 949, 4269, 19500, 91115, 429742, 2047660, 9820197, 47383255, 229725560, 1118568692, 5466616025, 26804560282, 131817042605, 649952289243 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The tiling of bricks is topologically the same as that by regular hexagons and this sequence can also be seen as counting polyhexes where two polyhexes are equivalent iff they are related by a symmetry that is also a symmetry of the tiling by bricks.
REFERENCES
Other references on polyforms are: www.mathpuzzle.com, Solomon W. Golomb, Ed Pegg, Eric Weisstein, David A. Klarner (Packing rectangles) and Michael Reid [These references should be expanded! - N. J. A. Sloane]
LINKS
Brendan Owen and Livio Zucca, Polyform generation
Brendan Owen and Livio Zucca, The 16 polybricks of order 4
CROSSREFS
Sequence in context: A019988 A137732 A119611 * A102461 A176332 A191241
KEYWORD
nonn,nice
AUTHOR
Warren Power (wjpnply(AT)hotmail.com), Oct 21 2000
EXTENSIONS
More terms from Don Reble, Nov 01 2001
Corrected and extended by Joseph Myers, Sep 21 2002
STATUS
approved

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Last modified March 19 03:27 EDT 2024. Contains 370952 sequences. (Running on oeis4.)