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: A008872 A008871 A008915 this_sequence A003806 A095442 A130682

Adjacent sequences: A003810 A003811 A003812 this_sequence A003814 A003815 A003816

nonn,easy

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