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 A181158 #5 Feb 09 2019 19:43:41 %S A181158 1,2,4,10,22,46,106,406,826,2386,5950,12466,37990,141262,577486 %N A181158 Where records occur in A181157. %C A181158 A181157(a(n)) = a(n). %K A181158 more,nonn %O A181158 1,2 %A A181158 Keisuke Sato (st(AT)r3z.org), Oct 07 2010 %E A181158 a(13)-a(15) from _Charlie Neder_, Feb 07 2019