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A006226
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Number of abstract n-dimensional crystallographic point groups.
(Formerly M1916)
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13
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OFFSET
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0,2
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REFERENCES
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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.
T. Janssen, Crystallographic Groups. North-Holland, Amsterdam, 1973, p. 73.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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W. Plesken and T. Schulz, CARAT Homepage [Cached copy in pdf format (without subsidiary pages), with permission]
W. Plesken and T. Schulz, Introduction to CARAT [Cached copy in pdf format (without subsidiary pages), with permission]
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CROSSREFS
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KEYWORD
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hard,nonn,more,nice
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AUTHOR
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EXTENSIONS
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Two more terms from W. Plesken and T. Schulz (tilman(AT)momo.math.rwth-aachen.de), Feb 27 2001
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STATUS
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approved
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