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A292157
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Number of Besźel [Beszel] Polycubes with n cells, identifying mirror images. A Besźel Polycube is a polycube whose cells each have two or more even coordinates.
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2
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OFFSET
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1,3
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COMMENTS
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This sequence also gives the number of Ul Qoma Polycubes with n cells. An Ul Qoma Polycube is a polycube whose cells each have two or more odd coordinates.
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REFERENCES
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China Miéville, The City & the City, Macmillan, 2009.
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LINKS
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Table of n, a(n) for n=1..10.
G. L. Sicherman, Catalogue of Besźel Polycubes
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EXAMPLE
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a(4) = 4 because 4 of the 8 tetracubes (I, L, T, K) can be embedded in the Besźel section of the cubic grid.
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CROSSREFS
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Cf. A292065: Number of Besźel Polycubes with n cells, distinguishing mirror images; A038119: Number of polycubes with n cells, identifying mirror images.
Sequence in context: A104430 A298255 A298926 * A256801 A103669 A230711
Adjacent sequences: A292154 A292155 A292156 * A292158 A292159 A292160
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KEYWORD
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nonn,more,hard
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AUTHOR
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George Sicherman, Sep 09 2017
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STATUS
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approved
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