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 A039666 #6 May 11 2007 03:00:00 %S A039666 1,3,15,30,35,56,70,78,105,140,168,190,210,248,264,357,420,570,616,630 %N A039666 Duplicate of A020493. %K A039666 dead %O A039666 1,2