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Take n-th string over {1,2} in lexicographic order and apply the Watanabe tag system {00, 1110} described in A291068 (but adapted to the alphabet {1,2}) just once.
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%I #10 Dec 12 2023 13:40:08

%S -1,21,1,1,221,221,11,11,11,11,2221,2221,2221,2221,111,211,111,211,

%T 111,211,111,211,12221,22221,12221,22221,12221,22221,12221,22221,1111,

%U 1211,2111,2211,1111,1211,2111,2211,1111,1211,2111,2211,1111,1211,2111

%N Take n-th string over {1,2} in lexicographic order and apply the Watanabe tag system {00, 1110} described in A291068 (but adapted to the alphabet {1,2}) just once.

%p See A291072.

%Y Cf. A007931, A284116, A291067, A291068, A291069.

%Y Cf. also A289673, A291072, A291074.

%K sign

%O 1,2

%A _N. J. A. Sloane_, Aug 18 2017