Position of n-th 1 in A031076.

Terms

a(0) =1a(1) =9a(2) =11a(3) =12a(4) =13a(5) =15a(6) =17a(7) =19a(8) =21a(9) =23a(10) =25a(11) =30a(12) =48a(13) =66a(14) =84a(15) =102a(16) =120a(17) =138a(18) =153a(19) =156a(20) =158a(21) =159a(22) =162a(23) =165a(24) =168a(25) =171a(26) =174a(27) =177a(28) =180a(29) =181