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 A057853 #12 Jul 09 2022 19:59:01 %S A057853 3,3,2,3,4,4,3,3,2,3,3,6,5,6,7,7,6,6,5,6,5,8,7,8,9,9,8,8,7,8,6,9,8,9, %T A057853 10,10,9,9,8,9,7,10,9,10,11,11,10,10,9,10,7,10,9,10,11,11,10,10,9,10, %U A057853 6,9,8,9,10,10,9,9,8,9,6,9,8,9,10,10,9,9,8,9,5,8,7,8,9,9,8,8,7,8,6,9,8,9 %N A057853 Number of letters in n (in Esperanto). %H A057853 Esperanto HyperCourse Maintainer, <a href="http://wwwtios.cs.utwente.nl/esperanto/hypercourse/getallen.html">Esperanto Hypercourse: Numbers</a> %H A057853 R. Green, <a href="http://mindprod.com/esperanto.html">Getting Started With Esperanto</a> %H A057853 WikiBooks, <a href="https://en.wikibooks.org/wiki/Esperanto:_A_Complete_and_Comprehensive_Grammar/Numbers">Esperanto: A Complete and Comprehensive Grammar/Numbers</a> %H A057853 <a href="/index/Lc#letters">Index entries for sequences related to number of letters in n</a> %e A057853 0 = nul; 1 = unu; 2 = du; 3 = tri; 4 = kvar; 5 = kvin; 6 = ses; 7 = sep; 8 = ok; 9 = naŭ; 10 = dek; ... %K A057853 easy,nice,nonn,word %O A057853 0,1 %A A057853 _Stewart Gordon_, Nov 11 2000