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

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =8a(5) =10a(6) =14a(7) =18a(8) =24a(9) =32a(10) =42a(11) =55a(12) =74a(13) =100a(14) =134a(15) =178a(16) =237a(17) =311a(18) =413a(19) =548a(20) =736a(21) =988a(22) =1314a(23) =1744a(24) =2309a(25) =3084a(26) =4130a(27) =5500a(28) =7336a(29) =9788