A hierarchical sequence (W'2{3}c - see A059126).

Terms

a(0) =12a(1) =96a(2) =12a(3) =768a(4) =12a(5) =96a(6) =12a(7) =6144a(8) =12a(9) =96a(10) =12a(11) =768a(12) =12a(13) =96a(14) =12a(15) =49152a(16) =12a(17) =96a(18) =12a(19) =768a(20) =12a(21) =96a(22) =12a(23) =6144a(24) =12a(25) =96a(26) =12a(27) =768a(28) =12a(29) =96