Number of collections of nonempty multisets with a total of 2n objects of exactly n colors.

A255907

Number of collections of nonempty multisets with a total of 2n objects of exactly n colors.

Terms

    a(0) =1a(1) =2a(2) =23a(3) =492a(4) =15800a(5) =693667a(6) =39371078a(7) =2780643510a(8) =237625842970

External references