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 A141540 #6 May 15 2018 08:49:13 %S A141540 1,1,1,1,4,1,1,6,6,1,1,8,12,8,1,1,10,20,20,10,1,1,12,30,40,30,12,1,1, %T A141540 14,42,70,70,42,14,1,1,16,56,112,140,112,56,16,1,1,18,72,168,252,252, %U A141540 168,72,18,1,1,20,90,240,420,504,420,240,90,20,1 %N A141540 Duplicate of A132046. %K A141540 dead %O A141540 1,5 %A A141540 _Roger L. Bagula_ and _Gary W. Adamson_, Aug 15 2008