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: A115539 A080129 A104839 this_sequence A003805 A115530 A120317

Adjacent sequences: A003809 A003810 A003811 this_sequence A003813 A003814 A003815

nonn,easy

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