a(n) = (24*n)^2.

Terms

a(0) =0a(1) =576a(2) =2304a(3) =5184a(4) =9216a(5) =14400a(6) =20736a(7) =28224a(8) =36864a(9) =46656a(10) =57600a(11) =69696a(12) =82944a(13) =97344a(14) =112896a(15) =129600a(16) =147456a(17) =166464a(18) =186624a(19) =207936a(20) =230400a(21) =254016a(22) =278784a(23) =304704a(24) =331776a(25) =360000a(26) =389376a(27) =419904a(28) =451584a(29) =484416