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: A020476 A104283 A003852 this_sequence A135955 A104840 A095436

Adjacent sequences: A003842 A003843 A003844 this_sequence A003846 A003847 A003848

nonn,easy

njas