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 A031996 #17 May 05 2020 10:28:54 %S A031996 0,1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,20,21,22,23,26,27,28, %T A031996 29,30,31,32,33,34,35,39,40,41,42,43,44,45,46,47,52,53,54,55,56,57,58, %U A031996 59,65,66,67,68,69,70,71,78,79,80,81,82,83,91 %N A031996 Duplicate of A023753. %Y A031996 Cf. A009994, A023767. %K A031996 dead %O A031996 1,3