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%I M2104
%S 1,2,17,230,4895
%N Number of n-dimensional space groups (including enantiomorphs).
%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 J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 102.
%D T. Janssen, Crystallographic Groups. North-Holland, Amsterdam, 1973, p. 119.
%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 Dror Bar-Natan, <a href="http://www.math.toronto.edu/~drorbn/Gallery/Symmetry/Tilings/index.html">Illustrations of 2-dimensional symmetry groups</a>
%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. A004029.
%K nonn,hard,nice
%O 0,2
%A _N. J. A. Sloane_.
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