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%I #4 May 10 2013 12:44:31
%S 256,2148007936,56713727820157015040139002378207625216,
%T 558658663747608212482251041591910255311640242524683057405682390247387063055565341158714756695500587176090293978181121308657577535237991794589785900711936
%N Number of equivalence classes of 4-valued Post functions of n variables under action of symmetric group S_n.
%D M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), p. 295.
%Y Cf. A000616, A001321-A001324.
%K nonn
%O 1,1
%A _Vladeta Jovovic_, Aug 09 2000
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