Place where n-th 1 occurs in A023132.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =9a(6) =12a(7) =15a(8) =18a(9) =22a(10) =26a(11) =30a(12) =35a(13) =40a(14) =45a(15) =51a(16) =57a(17) =64a(18) =71a(19) =78a(20) =86a(21) =94a(22) =102a(23) =111a(24) =120a(25) =129a(26) =139a(27) =149a(28) =159a(29) =170