n-th partial sum of A030298.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =7a(5) =8a(6) =10a(7) =13a(8) =14a(9) =17a(10) =19a(11) =21a(12) =22a(13) =25a(14) =27a(15) =30a(16) =31a(17) =34a(18) =35a(19) =37a(20) =40a(21) =42a(22) =43a(23) =44a(24) =46a(25) =49a(26) =53a(27) =54a(28) =56a(29) =60