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 A134849 #25 Aug 17 2020 06:03:35 %S A134849 3,3,3,4,4,4,4,5,5,4,6,6,6,7,6,7,7,8,8 %N A134849 Number of nonzero digits in A134847(n). %H A134849 J. Browkin, <a href="https://web.archive.org/web/20071220044826/http://www.impan.gov.pl/Kryptologia/GROEB1.pdf">Groebner basis</a> (in Polish). %Y A134849 Cf. A134843, A134844, A134845, A134846, A134847. %K A134849 nonn,base,more %O A134849 1,1 %A A134849 _Artur Jasinski_, Nov 13 2007 %E A134849 a(11)-a(15) from _Lars Blomberg_, Jun 25 2011 %E A134849 a(16)-a(19) (using A134847 bfile) from _Michel Marcus_, Aug 17 2020