50k^2-20k-23 interleaved with 50k^2+30k+17 for k=>0.

Terms

a(0) =-23a(1) =17a(2) =7a(3) =97a(4) =137a(5) =277a(6) =367a(7) =557a(8) =697a(9) =937a(10) =1127a(11) =1417a(12) =1657a(13) =1997a(14) =2287a(15) =2677a(16) =3017a(17) =3457a(18) =3847a(19) =4337a(20) =4777a(21) =5317a(22) =5807a(23) =6397a(24) =6937a(25) =7577a(26) =8167a(27) =8857a(28) =9497a(29) =10237