%I M5196 N2260 #25 Jun 04 2023 15:11:14

%S 27,10206,1271126683458,18476103676807778218052102700370958034,

%T 726580354049674651690925588215506430824419524245730549989258760312370548741057559799467925374036936715660160424670

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

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

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

%H Michael A. Harrison, <a href="https://www2.eecs.berkeley.edu/Pubs/TechRpts/1963/28677.html">The number of Symmetry Types of Post Functions</a>, EECS Department, University of California, Berkeley, Technical Report No. UCB/ERL M29, 1963.

%H M. A. Harrison and R. G. High, <a href="https://doi.org/10.1016/S0021-9800(68)80008-0">On the cycle index of a product of permutation groups</a>, J. Combin. Theory, 4 (1968), 277-299.

%Y Cf. A001323, A056668

%K nonn

%O 1,1

%A _N. J. A. Sloane_

%E More terms from _Vladeta Jovovic_, Feb 04 2000

%E More specific definition by _Christian Sievers_, Jun 04 2023