a(n) = (12*n)^2.

Terms

a(0) =0a(1) =144a(2) =576a(3) =1296a(4) =2304a(5) =3600a(6) =5184a(7) =7056a(8) =9216a(9) =11664a(10) =14400a(11) =17424a(12) =20736a(13) =24336a(14) =28224a(15) =32400a(16) =36864a(17) =41616a(18) =46656a(19) =51984a(20) =57600a(21) =63504a(22) =69696a(23) =76176a(24) =82944a(25) =90000a(26) =97344a(27) =104976a(28) =112896a(29) =121104