Number of union-closed partitions of weight n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =6a(7) =9a(8) =12a(9) =16a(10) =22a(11) =30a(12) =39a(13) =52a(14) =67a(15) =84a(16) =112a(17) =140a(18) =176a(19) =220a(20) =282a(21) =336a(22) =434a(23) =527a(24) =660a(25) =798a(26) =998a(27) =1186a(28) =1480a(29) =1767