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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

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: 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

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

Content is available under The OEIS End-User License Agreement .

Last modified November 28 12:57 EST 2014. Contains 250359 sequences.