a(n) = 5*n^2 - 4*n + 1.

Terms

a(0) =1a(1) =2a(2) =13a(3) =34a(4) =65a(5) =106a(6) =157a(7) =218a(8) =289a(9) =370a(10) =461a(11) =562a(12) =673a(13) =794a(14) =925a(15) =1066a(16) =1217a(17) =1378a(18) =1549a(19) =1730a(20) =1921a(21) =2122a(22) =2333a(23) =2554a(24) =2785a(25) =3026a(26) =3277a(27) =3538a(28) =3809a(29) =4090