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 A019271 #8 Mar 05 2019 01:52:16 %S A019271 0,2,4,5,7,10,11,13,15,17,19,20,22,24,26,28,29,30,32,33,36,37,39,40, %T A019271 43,44,46,48,49,52,53,55,57,60,61,62,64,65,66,67,68,70,71,72,73,74,76, %U A019271 77,79,80,81,82,85,86,87,89,90,91,92,94,95,96,98,99,100,103,104,105,106,107 %N A019271 A self-descriptive sequence: positions of consonants in "zero, two, four, ...". %H A019271 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a019/A019271.java">Java program</a> (github) %K A019271 word,nonn %O A019271 0,2 %A A019271 chris(AT)questrel.questrel.com (Chris Cole) %E A019271 a(38) onwards corrected by _Sean A. Irvine_, Mar 04 2019