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H. S. M. Coxeter and W. O. J. Moser, Generators and Relations for Discrete Groups, 4th ed., Springer-Verlag, NY, reprinted 1984, p. 131.
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.
Table of n, a(n) for n=1..4.
Sequence in context: A003942 A003935 A008872 * A008915 A217404 A003813
Adjacent sequences: A008868 A008869 A008870 * A008872 A008873 A008874
N. J. A. Sloane.