This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A291074 #10 Dec 12 2023 13:41:04
%S A291074 -1,22,1,1,222,222,11,11,11,11,1222,1222,1222,1222,111,211,111,211,
%T A291074 111,211,111,211,11222,21222,11222,21222,11222,21222,11222,21222,1111,
%U A291074 1211,2111,2211,1111,1211,2111,2211,1111,1211,2111,2211,1111,1211,2111
%N A291074 Take n-th string over {1,2} in lexicographic order and apply the Watanabe tag system {00, 0111} described in A291069 (but adapted to the alphabet {1,2}) just once.
%p A291074 See A291072.
%Y A291074 Cf. A007931, A284116, A291067, A291068, A291069.
%Y A291074 Cf. also A289673, A291072, A291073.
%K A291074 sign
%O A291074 1,2
%A A291074 _N. J. A. Sloane_, Aug 18 2017