A004032 Number of n-dimensional crystal families. (Formerly M3289)

1, 1, 4, 6, 23, 32, 91

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 A359863

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