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 A124146 #7 Mar 21 2014 01:54:44 %S A124146 1,2,5,10,20,50,100,500,1000,5000,10000,100000 %N A124146 U.S.A. currency denominations in dollars. %C A124146 The only currency denominations in dollars ever produced by the U.S. Treasury Department. Some are historical, no longer printed or circulated. The largest denomination was only used between banks, not individuals. The sum of this set is $116,688, as pointed out as the solution to a Math puzzle in the Gorbiski reference. %D A124146 Jeff and Lynn Gorbiski, "Ask Marilyn", Marilyn Vos Savant, syndicated column, Dec 10 2006. %K A124146 fini,full,nonn %O A124146 1,2 %A A124146 _Jonathan Vos Post_, Dec 13 2006