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 A195526 #8 Mar 31 2012 10:28:38 %S A195526 2,4,6,9,11,15,20,40,51,55,60,90,101,105,110,150,200,400,501,505,510, %T A195526 550,600,900,1001,1005,1010,1050,1100,1500,2000 %N A195526 Numbers written with two Roman numerals. %C A195526 The second group of numbers in A003587. %e A195526 2=II. 4=IV. 6=VI. 9=IX. 11=XI. 15=XV. %K A195526 nonn,base,fini,full,easy,less %O A195526 1,1 %A A195526 _Kausthub Gudipati_, Sep 20 2011