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 A084652 #2 Jan 09 2009 03:00:00 %S A084652 1,2,9,30,5838,7748,18941,20860,884009,919276,6366597,74329482, %T A084652 178532068,2130862251,2162384953,2614341660,4416513965,10812791039, %U A084652 11799700554,20743576863,36600453328,76931780134,109063095528 %N A084652 Engel expansion for tan(1). %Y A084652 Cf. A067919, A084651. %K A084652 nonn %O A084652 0,2 %A A084652 Hauke Worpel (hw1(AT)email.com), Jun 01 2003