6,1

J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985.

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 120.

H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984.

(MAGMA) [ #CoxeterGroup(Sprintf("E%o", n)) : n in [6..8]]; - from Sergei Haller (sergei(AT)sergei-haller.de), Dec 21 2006

Sequence in context: A076710 A152512 A147530 this_sequence A107654 A015359 A057851

Adjacent sequences: A003131 A003132 A003133 this_sequence A003135 A003136 A003137

nonn,fini,full,bref

N. J. A. Sloane (njas(AT)research.att.com).