A001328 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).

6, 438, 3962646, 10417184196975, 9954761196199929077325, 5057490251219818192322424165975972, 1930587876541100645614895805509354549563927698736, 746598793682620583344610283857629170831782164188262315836348333960

Offset: 2

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

• 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. A001324.

Extensions

More terms from Sean A. Irvine, Oct 08 2015

Typo in a(3) corrected by Sean A. Irvine, Nov 03 2015