Sum(j=1,n,floor(A000041(j)/j)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =10a(8) =13a(9) =17a(10) =22a(11) =28a(12) =35a(13) =44a(14) =55a(15) =69a(16) =86a(17) =107a(18) =132a(19) =163a(20) =200a(21) =245a(22) =299a(23) =364a(24) =442a(25) =535a(26) =646a(27) =778a(28) =935a(29) =1121