Number of integer partitions of n that can be partitioned into a set of sets.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =6a(7) =9a(8) =13a(9) =17a(10) =25a(11) =33a(12) =44a(13) =59a(14) =77a(15) =100a(16) =134a(17) =171a(18) =217a(19) =283a(20) =361a(21) =449a(22) =574a(23) =721a(24) =900a(25) =1126a(26) =1397a(27) =1731a(28) =2143a(29) =2632