2,1

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), 277-299.

Sequence in context: A165314 A000410 A028665 this_sequence A051735 A024084 A132590

Adjacent sequences: A001325 A001326 A001327 this_sequence A001329 A001330 A001331

nonn,bref

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