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A283612
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Number of sets of sequences of total length n over an alphabet of n letters with the symmetric group acting on the letters.
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1
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1, 1, 4, 13, 57, 252, 1322, 7361, 45057, 294392, 2054394, 15172872, 118175823, 966300054, 8268640847, 73825951226, 686049132714, 6620780612228, 66224775509130, 685372810735380, 7327272883303533
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OFFSET
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0,3
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REFERENCES
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E. Palmer and F. Harary, Graphical Enumeration, Academic Press, 1973.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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