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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..2.
Sequence in context: A219323 A095464 A072288 * A003847 A095466 A115555
Adjacent sequences: A003851 A003852 A003853 * A003855 A003856 A003857
N. J. A. Sloane.