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A004027 Arithmetic n-dimensional crystal classes.
(Formerly M2060)
7
1, 2, 13, 73, 710, 6079, 85308 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

H. Brown, R. Bülow, J. Neubüser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of Four-Dimensional Space. Wiley, NY, 1978, p. 52.

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.

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

Table of n, a(n) for n=0..6.

Experimental Mathematics, Home Page

W. Plesken and T. Schulz, CARAT Homepage

W. Plesken and T. Schulz, Counting crystallographic groups in low dimensions, Experimental Mathematics, 9 (No. 3, 2000), 407-411.

CROSSREFS

Cf. A004029, A006227.

Sequence in context: A163190 A242991 A240549 * A154357 A161130 A192700

Adjacent sequences:  A004024 A004025 A004026 * A004028 A004029 A004030

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(6) corrected from CARAT page by D. S. McNeil, Jan 02 2011

STATUS

approved

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Last modified October 24 20:44 EDT 2014. Contains 248516 sequences.