Position of n^2 - n + 1 in A003136.

Terms

a(0) =2a(1) =3a(2) =5a(3) =8a(4) =11a(5) =15a(6) =19a(7) =23a(8) =28a(9) =34a(10) =41a(11) =48a(12) =55a(13) =62a(14) =70a(15) =78a(16) =87a(17) =97a(18) =108a(19) =118a(20) =128a(21) =139a(22) =150a(23) =163a(24) =175a(25) =188a(26) =202a(27) =216a(28) =229a(29) =245