login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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: A061597 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 5 15:24 EST 2016. Contains 278770 sequences.