Number of permutations of n letters in the class Av_n(213;2).

A220903

Number of permutations of n letters in the class Av_n(213;2).

Terms

    a(0) =5a(1) =16a(2) =68a(3) =392a(4) =2905a(5) =25508a(6) =251188a(7) =2703440a(8) =31462590a(9) =393962080a(10) =5289624824a(11) =75921813328

External references