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 A055646 #3 Mar 30 2012 18:51:26 %S A055646 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,100,101,102,103,104,105,106,107, %T A055646 108,109,110,111,112,113,114,200,201,202,203,204,205,206,207,208,209, %U A055646 210,211,212,213,214,300,301,302,303,304,305,306,307,308,309,310,311 %N A055646 Integers in base 15 with each base 15 digit represented by 2 decimal digits. %Y A055646 Cf. A049872. %K A055646 base,easy,nonn %O A055646 0,3 %A A055646 _Henry Bottomley_, Jun 06 2000