Number of preferential arrangements of n labeled elements such that the minimal number of elements per rank equals 1.

A245854

Number of preferential arrangements of n labeled elements such that the minimal number of elements per rank equals 1.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =68a(4) =520a(5) =4542a(6) =46550a(7) =540136a(8) =7045020a(9) =101865410a(10) =1619046418a(11) =28053492348a(12) =526430246264

External references