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 A323478 #8 Feb 02 2019 09:12:49 %S A323478 1,1,2,21,221,22121,221212111,221212111211113, %T A323478 221212111211113211113141,221212111211113211113141211113141141111, %U A323478 22121211121111321111314121111314114111121111314114111114111214 %N A323478 a(1)=1; thereafter, a(n) = string appended to (n-1)-st generation of A306211 to get the n-th generation. %C A323478 The concatenation of these terms is the sequence A306211 itself. %C A323478 The concatenation A323477(n-1) followed by a(n) is A323477(n). For example, if n=6, 11221221.22121 = 1122122122121. %C A323478 The strings a(n) are converging to A323826, the RUNS transform of A306211. %H A323478 N. J. A. Sloane, <a href="/A323478/b323478.txt">Table of n, a(n) for n = 1..17</a> %Y A323478 Cf. A306211, A323477, A306215, A323475 (lengths), A323826 (limiting string). %K A323478 nonn,base %O A323478 1,3 %A A323478 _N. J. A. Sloane_, Jan 31 2019