Take n-th string over {1,2} in lexicographic order and apply the Watanabe tag system {00, 1011} described in A291067 (but adapted to the alphabet {1,2}) just once.

A291072

Take n-th string over {1,2} in lexicographic order and apply the Watanabe tag system {00, 1011} described in A291067 (but adapted to the alphabet {1,2}) just once.

Terms

    a(0) =-1a(1) =22a(2) =1a(3) =1a(4) =122a(5) =122a(6) =11a(7) =11a(8) =11a(9) =11a(10) =2122a(11) =2122a(12) =2122a(13) =2122a(14) =111a(15) =211a(16) =111a(17) =211a(18) =111a(19) =211a(20) =111a(21) =211a(22) =12122a(23) =22122a(24) =12122a(25) =22122a(26) =12122a(27) =22122a(28) =12122a(29) =22122

External references