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.

LINKS

G. L. Sicherman, Catalogue of Besźel Polycubes

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

KEYWORD

nonn,more,hard

AUTHOR

George Sicherman, Sep 08 2017

STATUS

approved