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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.
Table of n, a(n) for n=1..4.
Sequence in context: A008871 A008915 A217404 * A003806 A217422 A095442
Adjacent sequences: A003810 A003811 A003812 * A003814 A003815 A003816
N. J. A. Sloane.