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A001328
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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).
(Formerly M4309 N1804)
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0
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6, 438, 3962646, 10417184196975, 9954761196199929077325, 5057490251219818192322424165975972, 1930587876541100645614895805509354549563927698736, 746598793682620583344610283857629170831782164188262315836348333960
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OFFSET
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2,1
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REFERENCES
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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).
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LINKS
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Table of n, a(n) for n=2..9.
M. A. Harrison and R. G. High, On the cycle index of a product of permutation groups, J. Combin. Theory, 4 (1968), 277-299.
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CROSSREFS
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Cf. A001324.
Sequence in context: A028665 A231316 A270066 * A174777 A265168 A187514
Adjacent sequences: A001325 A001326 A001327 * A001329 A001330 A001331
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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More terms from Sean A. Irvine, Oct 08 2015
Typo in a(3) corrected by Sean A. Irvine, Nov 03 2015
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STATUS
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approved
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