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A004031 Number of n-dimensional crystal systems.
(Formerly M3317)
1
1, 1, 4, 7, 33 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

H. Brown, R. B\"{u}low, J. Neub\"{u}ser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of Four-Dimensional Space. Wiley, NY, 1978, p. 52.

P. Engel, ``Geometric crystallography,'' in P. M. Gruber and J. M. Wills, editors, Handbook of Convex Geometry. North-Holland, Amsterdam, Vol. B, pp. 989-1041.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..4.

CROSSREFS

Sequence in context: A000289 A241426 A149089 * A243863 A153062 A237424

Adjacent sequences:  A004028 A004029 A004030 * A004032 A004033 A004034

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 14 21:54 EDT 2014. Contains 246769 sequences.