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: A058446 A095456 A104319 this_sequence A003936 A120318 A095458

Adjacent sequences: A003940 A003941 A003942 this_sequence A003944 A003945 A003946

nonn,easy,bref

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