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 A066555 #6 Dec 05 2013 19:55:05 %S A066555 2,46,810,1214,16182,22242,6283032,34363840,424446485,525456586, %T A066555 6264666870,727476788082,8486889092949,69810010210410,610811011211411, %U A066555 6118120122124126,12813013213413613,814014214414614815 %N A066555 a(n) = next substring in concatenation of even numbers with length n (incl. leading zeros). %e A066555 a(1)..a(5) = 246810121416182, a(6) = 022242 (leading zero not shown). %Y A066555 Cf. A066553. %K A066555 nonn,base,dumb %O A066555 1,1 %A A066555 _Amarnath Murthy_, Dec 17 2001 %E A066555 Edited by _Frank Ellermann_, Feb 04 2002