a(n) = 78*n^2 + 1.

Terms

a(0) =1a(1) =79a(2) =313a(3) =703a(4) =1249a(5) =1951a(6) =2809a(7) =3823a(8) =4993a(9) =6319a(10) =7801a(11) =9439a(12) =11233a(13) =13183a(14) =15289a(15) =17551a(16) =19969a(17) =22543a(18) =25273a(19) =28159a(20) =31201a(21) =34399a(22) =37753a(23) =41263a(24) =44929a(25) =48751a(26) =52729a(27) =56863a(28) =61153a(29) =65599