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: A109479 A003808 A011786 this_sequence A119648 A127224 A114613

Adjacent sequences: A003798 A003799 A003800 this_sequence A003802 A003803 A003804

nonn,easy

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