Position of n-th 1 in A031045.

Terms

a(0) =1a(1) =9a(2) =10a(3) =11a(4) =13a(5) =15a(6) =17a(7) =19a(8) =21a(9) =23a(10) =26a(11) =42a(12) =58a(13) =74a(14) =90a(15) =106a(16) =122a(17) =123a(18) =125a(19) =128a(20) =131a(21) =134a(22) =137a(23) =140a(24) =143a(25) =145a(26) =146a(27) =147a(28) =148a(29) =149