OFFSET
1,2
REFERENCES
R. L. E. Schwarzenberger, $N$-Dimensional Crystallography. Pitman, London, 1980, p. 34.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Bernd Souvignier, Enantiomorphism of crystallographic groups in higher dimensions with results in dimensions up to 6, Acta Cryst. (2003). A59, 210-220.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(6) (found by Souvignier) sent by Vladeta Jovovic, Jul 16 2007
STATUS
approved