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M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), 277-299.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..5.
Sequence in context: A174637 A243215 A162449 * A263589 A008994 A036214
Adjacent sequences: A001322 A001323 A001324 * A001326 A001327 A001328
N. J. A. Sloane.
Definition improved and more terms from Sean A. Irvine, Oct 01 2015