2,1

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

Sequence in context: A113643 A115537 A118466 this_sequence A003803 A068243 A034656

Adjacent sequences: A003807 A003808 A003809 this_sequence A003811 A003812 A003813

nonn,easy

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