a(n) = (9*n + 7)^2.

Terms

a(0) =49a(1) =256a(2) =625a(3) =1156a(4) =1849a(5) =2704a(6) =3721a(7) =4900a(8) =6241a(9) =7744a(10) =9409a(11) =11236a(12) =13225a(13) =15376a(14) =17689a(15) =20164a(16) =22801a(17) =25600a(18) =28561a(19) =31684a(20) =34969a(21) =38416a(22) =42025a(23) =45796a(24) =49729a(25) =53824a(26) =58081a(27) =62500a(28) =67081a(29) =71824