Number of colored set partitions of [n] where colors of the elements of subsets are in (weakly) increasing order and exactly two colors are used.

A325890

Number of colored set partitions of [n] where colors of the elements of subsets are in (weakly) increasing order and exactly two colors are used.

Terms

    a(0) =3a(1) =20a(2) =122a(3) =774a(4) =5247a(5) =38198a(6) =298139a(7) =2485690a(8) =22045130a(9) =207125874a(10) =2053771931a(11) =21416863948a(12) =234145149539

External references