a(n) = (5*n + 2)^2.

Terms

a(0) =4a(1) =49a(2) =144a(3) =289a(4) =484a(5) =729a(6) =1024a(7) =1369a(8) =1764a(9) =2209a(10) =2704a(11) =3249a(12) =3844a(13) =4489a(14) =5184a(15) =5929a(16) =6724a(17) =7569a(18) =8464a(19) =9409a(20) =10404a(21) =11449a(22) =12544a(23) =13689a(24) =14884a(25) =16129a(26) =17424a(27) =18769a(28) =20164a(29) =21609