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 A028359 #25 Apr 19 2024 01:59:53 %S A028359 1,2,12,121,212,1212,12121,21212,121212,1212121,2121212,12121212, %T A028359 121212121,212121212,1212121212,12121212121,21212121212,121212121212, %U A028359 1212121212121,2121212121212,12121212121212,121212121212121,212121212121212,1212121212121212,12121212121212121 %N A028359 Two-bell analog of A028355. %C A028359 Consider the infinite digits: 121212... . We can break this into a sequence of integers such that the sum of digits in the n-th value is n. - _Seiichi Manyama_, Oct 31 2018 %H A028359 Seiichi Manyama, <a href="/A028359/b028359.txt">Table of n, a(n) for n = 1..1500</a> %F A028359 Conjectures from _Chai Wah Wu_, Apr 18 2024: (Start) %F A028359 a(n) = 101*a(n-3) - 100*a(n-6) for n > 6. %F A028359 G.f.: x*(10*x^4 + 20*x^3 + 12*x^2 + 2*x + 1)/(100*x^6 - 101*x^3 + 1). (End) %Y A028359 Cf. A000034, A028355. %K A028359 nonn,base %O A028359 1,2 %A A028359 _N. J. A. Sloane_ %E A028359 More terms from _Seiichi Manyama_, Oct 31 2018