Normalized extreme values for "3x+1" trees of depth n.

Terms

a(0) =4a(1) =8a(2) =14a(3) =24a(4) =42a(5) =76a(6) =138a(7) =254a(8) =470a(9) =876a(10) =1638a(11) =3070a(12) =5766a(13) =10850a(14) =20436a(15) =38550a(16) =72806a(17) =137670a(18) =260612a(19) =493824a(20) =936690a(21) =1778360a(22) =3379372a(23) =6427190a(24) =12232928a(25) =23300652a(26) =44414366a(27) =84713872a(28) =161686324a(29) =308780220