Sum over all partitions of n of the number of distinct parts i of multiplicity i.

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =2a(5) =3a(6) =3a(7) =6a(8) =7a(9) =12a(10) =15a(11) =22a(12) =27a(13) =40a(14) =49a(15) =68a(16) =87a(17) =116a(18) =145a(19) =193a(20) =239a(21) =311a(22) =387a(23) =494a(24) =611a(25) =776a(26) =952a(27) =1193a(28) =1464a(29) =1817