Trajectory of 4 under repeated application of x -> A306958(x).

Terms

a(0) =4a(1) =5040a(2) =35282a(3) =1845540a(4) =1884971a(5) =7867460a(6) =3331441a(7) =12260a(8) =151391a(9) =3659790a(10) =8044561a(11) =2005931a(12) =3659862a(13) =5776650a(14) =1572481a(15) =2454590a(16) =3699451a(17) =7444810a(18) =2434331a(19) =12340a(20) =5861a(21) =1995850a(22) =9132491a(23) =7263470a(24) =1366651a(25) =484580a(26) =3669121a(27) =3932030a(28) =3631052a(29) =182981