Number of non-isomorphic aperiodic multiset partitions of weight n.

Terms

a(0) =1a(1) =3a(2) =9a(3) =29a(4) =90a(5) =285a(6) =909a(7) =2984a(8) =9935a(9) =34113a(10) =119368a(11) =428923a(12) =1574223a(13) =5915235a(14) =22699730a(15) =89000042a(16) =356058539a(17) =1453069854a(18) =6044132793a(19) =25612564200a(20) =110503626702a(21) =485161228675