a(n) is the numerator of harmonic mean of a(n-1) and a(n-2).

Terms

a(0) =2a(1) =3a(2) =12a(3) =24a(4) =16a(5) =96a(6) =192a(7) =128a(8) =768a(9) =1536a(10) =1024a(11) =6144a(12) =12288a(13) =8192a(14) =49152a(15) =98304a(16) =65536a(17) =393216a(18) =786432a(19) =524288a(20) =3145728a(21) =6291456a(22) =4194304a(23) =25165824a(24) =50331648a(25) =33554432a(26) =201326592a(27) =402653184a(28) =268435456a(29) =1610612736