Place where n-th 1 occurs in A023117.

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =25a(5) =37a(6) =51a(7) =67a(8) =85a(9) =106a(10) =129a(11) =154a(12) =181a(13) =211a(14) =243a(15) =277a(16) =313a(17) =352a(18) =393a(19) =436a(20) =481a(21) =528a(22) =578a(23) =630a(24) =684a(25) =740a(26) =799a(27) =860a(28) =923a(29) =988