A001321 Number of equivalence classes of 3-valued Post functions of n variables under action of symmetric group S_n. (Formerly M5196 N2260)

27, 10206, 1271126683458, 18476103676807778218052102700370958034, 726580354049674651690925588215506430824419524245730549989258760312370548741057559799467925374036936715660160424670

Offset

1,1

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

Table of n, a(n) for n=1..5.

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

Sequence in context: A013828 A343922 A209261 * A263601 A111415 A036534

Adjacent sequences: A001318 A001319 A001320 * A001322 A001323 A001324

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Vladeta Jovovic, Feb 04 2000

More specific definition by Christian Sievers, Jun 04 2023

Status

approved