Sum of multinomials M(n; lambda), where lambda ranges over all partitions of n into parts that form a set of size two.

A327826

Sum of multinomials M(n; lambda), where lambda ranges over all partitions of n into parts that form a set of size two.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =16a(5) =125a(6) =711a(7) =5915a(8) =46264a(9) =438681a(10) =4371085a(11) =49321745a(12) =588219523a(13) =7751724513a(14) =108240044745

External references