Trajectory of 3 under map n->25n+1 if n odd, n->n/2 if n even.

Terms

a(0) =3a(1) =76a(2) =38a(3) =19a(4) =476a(5) =238a(6) =119a(7) =2976a(8) =1488a(9) =744a(10) =372a(11) =186a(12) =93a(13) =2326a(14) =1163a(15) =29076a(16) =14538a(17) =7269a(18) =181726a(19) =90863a(20) =2271576a(21) =1135788a(22) =567894a(23) =283947a(24) =7098676a(25) =3549338a(26) =1774669a(27) =44366726a(28) =22183363a(29) =554584076