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A071882 Number of contraction types of n-dimensional parallelohedra. 3
1, 1, 2, 5, 52, 179372 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

Or, number of inequivalent Delaunay [Delone] decompositions of R^n.

REFERENCES

P. Engel, The contraction types of parallelohedra in E^5, Acta Cryst. A 56 (2002), 491-496.

M. I. Stogrin, Regular Dirichlet-Voronoi partitions for the second triclinic group, Trudy Matematicheskogo Instituta imeni V. A. Steklova, 123 (1973) = Proceedings of the Steklov Institute of Mathematics, 123 (1973).

CROSSREFS

Cf. A071880, A071881.

Sequence in context: A005114 A081090 A071880 * A206848 A081482 A134475

Adjacent sequences:  A071879 A071880 A071881 * A071883 A071884 A071885

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Jun 10 2002

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Last modified February 15 18:47 EST 2012. Contains 205837 sequences.