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 A111387 #8 Dec 05 2013 19:57:05 %S A111387 5,63,35,63,335,603,335,6003,3335,6003,33335,60003,33335,600003, %T A111387 333335,6000003,3333335,6000003,3333335,60000003,33333335,600000003, %U A111387 333333335,600000003,3333333335,6000000003,3333333335,60000000003 %N A111387 A111386(n-1) concatenated with A111386(n+1) divided by A111386(n). %e A111387 15/3 = 5, 315/5 = 63. %Y A111387 Cf. A111386. %K A111387 base,nonn %O A111387 2,1 %A A111387 _Amarnath Murthy_, Nov 11 2005 %E A111387 More terms from _R. J. Mathar_, Aug 20 2007 %E A111387 More terms computed from A111386. _Max Alekseyev_, Oct 17 2008