n-th partial sum of A030496.

Terms

a(0) =1a(1) =3a(2) =4a(3) =5a(4) =7a(5) =10a(6) =12a(7) =13a(8) =16a(9) =17a(10) =19a(11) =21a(12) =24a(13) =25a(14) =27a(15) =28a(16) =31a(17) =32a(18) =35a(19) =37a(20) =38a(21) =40a(22) =43a(23) =47a(24) =50a(25) =52a(26) =53a(27) =57a(28) =60a(29) =61