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 A299301 #5 Feb 25 2018 22:09:40 %S A299301 1,11,110,1109,11099,110999,1109999,11099999,110999999,1109999999, %T A299301 11099999999,110999999990,1109999999909,11099999999099, %U A299301 110999999990999,1109999999909990,11099999999099900,110999999990999009,1109999999909990099,11099999999099900999,110999999990999009990,1109999999909990099900,11099999999099900999000 %N A299301 Partial sums of A300000. %C A299301 a(n) is also the concatenation of the first n digits of A300000. %Y A299301 Cf. A300000. %K A299301 nonn,base %O A299301 1,2 %A A299301 _N. J. A. Sloane_, Feb 25 2018