a(n) = 3n*4^(2n-1).A193132a(n) = 3n*4^(2n-1).Terms a(0) =12a(1) =384a(2) =9216a(3) =196608a(4) =3932160a(5) =75497472a(6) =1409286144a(7) =25769803776a(8) =463856467968External referencesoeis: A193132