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

A283612

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

Terms

    a(0) =1a(1) =1a(2) =4a(3) =13a(4) =57a(5) =252a(6) =1322a(7) =7361a(8) =45057a(9) =294392a(10) =2054394a(11) =15172872a(12) =118175823a(13) =966300054a(14) =8268640847a(15) =73825951226a(16) =686049132714

External references