The definition is not clear to me.
N. L. Smirnova and V. S. Urusov, Fundamental law of crystal symmetry by Shubnikov, its applications and restrictions, Computers and Mathematics with Applications, 16 (1988), 563-567.
Table of n, a(n) for n=1..10.
Sequence in context: A130898 A199016 A088314 * A105420 A058641 A212253
Adjacent sequences: A097068 A097069 A097070 * A097072 A097073 A097074
N. J. A. Sloane, Sep 15 2004