|
%I M1965
%S 1,2,10,32,227,955,7103
%N Geometric n-dimensional crystal classes.
%D H. Brown, R. B\"{u}low, J. Neub\"{u}ser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of Four-Dimensional Space. Wiley, NY, 1978, p. 52.
%D P. Engel, ``Geometric crystallography,'' in P. M. Gruber and J. M. Wills, editors, Handbook of Convex Geometry. North-Holland, Amsterdam, Vol. B, pp. 989-1041.
%D T. Janssen, Crystallographic Groups. North-Holland, Amsterdam, 1973, p. 73.
%D W. Plesken and T. Schulz, Counting crystallographic groups in low dimensions, Experimental Mathematics, 9 (No. 3, 2000), 407-411.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H W. Plesken and T. Schulz, <a href="http://wwwb.math.rwth-aachen.de/carat/">CARAT Homepage</a>
%H Experimental Mathematics, <a href="http://www.emis.de/journals/EM/">Home Page</a>
%Y Cf. A004027, A004029.
%K nonn,hard,nice
%O 0,2
%A _N. J. A. Sloane_.
%E a(6) corrected from CARAT page by _D. S. McNeil_, Jan 02 2011
|
