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A270862 Number of polycubes with n cells, allowing edge connections as well as face connections, distinguishing mirror images. 2
1, 2, 9, 88, 1103, 17570, 295506 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Jørgen Lou, Danish Patent 126840 (27 August 1973).

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

a(3)=9 because there are 8 ways to join 3 cells in the cubic grid at faces or edges, identifying reflections, and one of those 8 has distinct mirror images, which makes 9.

CROSSREFS

Cf. A268666 (identifying mirror images), A000162, A030222 (2-dimensional polyplets).

Sequence in context: A106163 A278332 A135747 * A259794 A132431 A228509

Adjacent sequences:  A270859 A270860 A270861 * A270863 A270864 A270865

KEYWORD

nonn,nice,more,hard

AUTHOR

George Sicherman, Mar 24 2016

STATUS

approved

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Last modified October 17 18:58 EDT 2019. Contains 328127 sequences. (Running on oeis4.)