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: A082249 A125735 A017544 this_sequence A003844 A132909 A104834

Adjacent sequences: A003848 A003849 A003850 this_sequence A003852 A003853 A003854

nonn,easy

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