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 A174892 #13 Jan 14 2020 01:30:25 %S A174892 0,1,1,1,1,2,1,3,1,2,1,7,1,2,2,7,1,7,1,7,2,2,1,19,1,2,3,7,1,13,1,15,2, %T A174892 2,2,25,1,2,2,19,1,13,1,7,7,2,1,47,1,7,2,7,1,19,2,19,2,2,1,43,1,2,7, %U A174892 31,2,13,1,7,2,13,1,75,1,2,7,7,2 %N A174892 a(n) = A074206(n) - A174889(n). %Y A174892 Cf. A074206, A174888, A174889, A174891. %K A174892 nonn %O A174892 1,6 %A A174892 _Mats Granvik_, Apr 01 2010