a(n) = (10*n + 8)^2.

Terms

a(0) =64a(1) =324a(2) =784a(3) =1444a(4) =2304a(5) =3364a(6) =4624a(7) =6084a(8) =7744a(9) =9604a(10) =11664a(11) =13924a(12) =16384a(13) =19044a(14) =21904a(15) =24964a(16) =28224a(17) =31684a(18) =35344a(19) =39204a(20) =43264a(21) =47524a(22) =51984a(23) =56644a(24) =61504a(25) =66564a(26) =71824a(27) =77284a(28) =82944a(29) =88804