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: A008871 A008915 A003813 this_sequence A095442 A130682 A104304

Adjacent sequences: A003803 A003804 A003805 this_sequence A003807 A003808 A003809

nonn,easy

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