a(n) = NumberOfPartitions(n) * ( tau(n)-1 ).

Terms

a(0) =0a(1) =2a(2) =3a(3) =10a(4) =7a(5) =33a(6) =15a(7) =66a(8) =60a(9) =126a(10) =56a(11) =385a(12) =101a(13) =405a(14) =528a(15) =924a(16) =297a(17) =1925a(18) =490a(19) =3135a(20) =2376a(21) =3006a(22) =1255a(23) =11025a(24) =3916a(25) =7308a(26) =9030a(27) =18590a(28) =4565a(29) =39228