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: A132902 A020476 A104283 this_sequence A003845 A144134 A135955

Adjacent sequences: A003849 A003850 A003851 this_sequence A003853 A003854 A003855

nonn,easy

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