Sum of the divisors of the n-th Bell number.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =24a(5) =98a(6) =240a(7) =878a(8) =13104a(9) =34560a(10) =143840a(11) =1628640a(12) =4421376a(13) =27644438a(14) =291751956a(15) =1666163520a(16) =10523628456a(17) =216625138884a(18) =779556556800