0,2

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

H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.

Numbers so far appear to equal A053290(n)/2. - R. Stephan, Mar 30 2004

Sequence in context: A106207 A100089 A151598 this_sequence A002555 A002198 A163576

Adjacent sequences: A003784 A003785 A003786 this_sequence A003788 A003789 A003790

nonn,easy

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