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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.
1

%I #12 Mar 12 2017 04:31:35

%S 1,1,4,13,57,252,1322,7361,45057,294392,2054394,15172872,118175823,

%T 966300054,8268640847,73825951226,686049132714,6620780612228,

%U 66224775509130,685372810735380,7327272883303533

%N Number of sets of sequences of total length n over an alphabet of n letters with the symmetric group acting on the letters.

%D E. Palmer and F. Harary, Graphical Enumeration, Academic Press, 1973.

%H Bob Lucassen, Marko Riedel, <a href="http://math.stackexchange.com/questions/2180525">Counting sets of unlabeled sequences of total cardinality n</a>

%H Marko Riedel, <a href="/A283612/a283612_1.maple.txt">Maple code for A283612 by total enumeration and by Power Group Enumeration.</a>

%K nonn,more

%O 0,3

%A _Marko Riedel_, Mar 11 2017