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: A115537 A118466 A003810 this_sequence A068243 A034656 A119478

Adjacent sequences: A003800 A003801 A003802 this_sequence A003804 A003805 A003806

nonn,easy

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