Number of ways of partitioning the multiset {1,1,2,3,...,n-1} into exactly four nonempty parts.

A168584

Number of ways of partitioning the multiset {1,1,2,3,...,n-1} into exactly four nonempty parts.

Terms

    a(0) =1a(1) =7a(2) =41a(3) =215a(4) =1041a(5) =4767a(6) =21001a(7) =90055a(8) =378881a(9) =1572527a(10) =6463161a(11) =26375895a(12) =107081521a(13) =433076287a(14) =1746588521a(15) =7029269735a(16) =28245956961a(17) =113370724047a(18) =454644109081

External references