Number of labeled partitions of (n,n) into pairs (i,j).

A108459

Number of labeled partitions of (n,n) into pairs (i,j).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =52a(4) =855a(5) =19921a(6) =614866a(7) =24040451a(8) =1152972925a(9) =66200911138

External references