Place where n-th 1 occurs in A023119.

Terms

a(0) =1a(1) =4a(2) =10a(3) =18a(4) =29a(5) =43a(6) =59a(7) =78a(8) =100a(9) =124a(10) =151a(11) =181a(12) =213a(13) =248a(14) =286a(15) =326a(16) =369a(17) =414a(18) =462a(19) =513a(20) =566a(21) =622a(22) =681a(23) =742a(24) =806a(25) =873a(26) =942a(27) =1014a(28) =1089a(29) =1166