cp's OEIS Frontend

A006226 Number of abstract n-dimensional crystallographic point groups.

%I A006226 M1916 #40 Nov 06 2017 02:39:23
%S A006226 1,2,9,18,118,239,1594
%N A006226 Number of abstract n-dimensional crystallographic point groups.
%D A006226 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 A006226 T. Janssen, Crystallographic Groups. North-Holland, Amsterdam, 1973, p. 73.
%D A006226 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006226 A. C. Hurley, <a href="http://dx.doi.org/10.1017/S0305004100027109">Finite rotation groups and crystal classes in four dimensions</a>, Proc. Cambridge Philos. Soc. 47, (1951). 650-661.
%H A006226 A. C. Hurley, <a href="http://dx.doi.org/10.1107/S0365110X67001227">Crystal Classes of Four-Dimensional Space R4</a>, Acta Crystallog., 22 (1967), see especially p. 605.
%H A006226 W. Plesken and T. Schulz, <a href="http://projecteuclid.org/euclid.em/1045604675">Counting crystallographic groups in low dimensions</a>, Experimental Mathematics, 9 (No. 3, 2000), 407-411.
%H A006226 W. Plesken and T. Schulz, <a href="http://wwwb.math.rwth-aachen.de/carat/">CARAT Homepage</a>
%H A006226 W. Plesken and T. Schulz, <a href="/A006226/a006226.pdf">CARAT Homepage</a> [Cached copy in pdf format (without subsidiary pages), with permission]
%H A006226 W. Plesken and T. Schulz, <a href="/A006226/a006226_1.pdf">Introduction to CARAT</a> [Cached copy in pdf format (without subsidiary pages), with permission]
%H A006226 E. S. Rosenthal & N. J. A. Sloane, <a href="/A004028/a004028.pdf">Correspondence, 1975</a>
%Y A006226 Cf. A004027, A004028, A004029.
%K A006226 hard,nonn,more,nice
%O A006226 0,2
%A A006226 _N. J. A. Sloane_
%E A006226 Two more terms from W. Plesken and T. Schulz (tilman(AT)momo.math.rwth-aachen.de), Feb 27 2001
%E A006226 Offset corrected by _Andrey Zabolotskiy_, Jul 10 2017