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: A035926 A145535 A109479 this_sequence A011786 A003801 A119648

Adjacent sequences: A003805 A003806 A003807 this_sequence A003809 A003810 A003811

nonn,easy

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