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%I M4309 N1804 #25 Nov 03 2015 17:15:04
%S 6,438,3962646,10417184196975,9954761196199929077325,
%T 5057490251219818192322424165975972,
%U 1930587876541100645614895805509354549563927698736,746598793682620583344610283857629170831782164188262315836348333960
%N Number of equivalence classes of n-valued Post functions of 2 variables under action of semi-direct product of symmetric groups S_2 and S(2,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 M. A. Harrison and R. G. High, <a href="http://dx.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. A001324.
%K nonn
%O 2,1
%A _N. J. A. Sloane_
%E More terms from _Sean A. Irvine_, Oct 08 2015
%E Typo in a(3) corrected by _Sean A. Irvine_, Nov 03 2015
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