%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