Sum over all partitions of n of the LCM of the parts.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =12a(5) =23a(6) =38a(7) =73a(8) =118a(9) =198a(10) =318a(11) =530a(12) =819a(13) =1298a(14) =1974a(15) =2975a(16) =4516a(17) =6698a(18) =9980a(19) =14550a(20) =21186a(21) =30304a(22) =43503a(23) =62030a(24) =87908a(25) =123292a(26) =172543a(27) =239720a(28) =331688a(29) =458198