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A292065
Number of Besźel [Beszel] Polycubes with n cells, distinguishing mirror images. A Besźel polycube is a polycube whose cells each have two or more even coordinates.
2
1, 1, 2, 4, 12, 27, 106, 339, 1336, 5029
OFFSET
1,3
COMMENTS
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.
REFERENCES
China Miéville, The City & the City, Macmillan, 2009.
EXAMPLE
a(4) = 4 because 4 of the 8 tetracubes (I, L, T, K) can be embedded in the Besźel section of the cubic grid.
CROSSREFS
Cf. A292157: Number of Besźel Polycubes with n cells, identifying mirror images; A000162: Number of polycubes with n cells [distinguishing mirror images].
Sequence in context: A148173 A148174 A232218 * A193893 A096581 A275434
KEYWORD
nonn,more,hard
AUTHOR
George Sicherman, Sep 08 2017
STATUS
approved