A001321 Number of equivalence classes of 3-valued Post functions of n variables under action of symmetric group S_n.

27, 10206, 1271126683458, 18476103676807778218052102700370958034, 726580354049674651690925588215506430824419524245730549989258760312370548741057559799467925374036936715660160424670

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

References

• 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).

Links

• Michael A. Harrison, The number of Symmetry Types of Post Functions, EECS Department, University of California, Berkeley, Technical Report No. UCB/ERL M29, 1963.
• M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), 277-299.

Crossrefs

Cf. A001323, A056668

Extensions

More terms from Vladeta Jovovic, Feb 04 2000

More specific definition by Christian Sievers, Jun 04 2023