Place where n-th 1 occurs in A023116.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =12a(6) =16a(7) =21a(8) =26a(9) =32a(10) =38a(11) =45a(12) =52a(13) =60a(14) =69a(15) =78a(16) =88a(17) =98a(18) =109a(19) =120a(20) =132a(21) =145a(22) =158a(23) =172a(24) =186a(25) =201a(26) =217a(27) =233a(28) =250a(29) =267