a(n) = 1250*n^2 + 100*n + 1.

Terms

a(0) =1351a(1) =5201a(2) =11551a(3) =20401a(4) =31751a(5) =45601a(6) =61951a(7) =80801a(8) =102151a(9) =126001a(10) =152351a(11) =181201a(12) =212551a(13) =246401a(14) =282751a(15) =321601a(16) =362951a(17) =406801a(18) =453151a(19) =502001a(20) =553351a(21) =607201a(22) =663551a(23) =722401a(24) =783751a(25) =847601a(26) =913951a(27) =982801a(28) =1054151a(29) =1128001