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A004032 Number of n-dimensional crystal families.
(Formerly M3289)
0
1, 1, 4, 6, 23, 32, 91 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

H. Brown, R. Bülow, J. Neubüser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of Four-Dimensional Space. Wiley, NY, 1978, p. 52.

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..6.

W. Plesken and T. Schulz, Counting crystallographic groups in low dimensions, Experimental Mathematics, Volume 9 Issue 3 (2000), 321-478

Wikipedia, Space_group

CROSSREFS

Cf. A004027-A004031, A006226, A006227.

Sequence in context: A062940 A075813 A107952 * A123046 A237748 A087784

Adjacent sequences:  A004029 A004030 A004031 * A004033 A004034 A004035

KEYWORD

hard,nonn,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(5)-a(6) from Henry Bottomley, Feb 03 2014

STATUS

approved

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Last modified September 20 06:01 EDT 2014. Contains 246988 sequences.