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 A135454 #3 Mar 31 2012 20:08:08 %S A135454 1,6,21,52,103,174,262,360,461,561,660,759,858,957,1056,1155,1254, %T A135454 1353,1452,1551,1650,1749,1848,1947,2046,2145,2244,2343,2442,2541, %U A135454 2640,2739,2838,2937,3036,3135,3234,3333,3432,3531,3630,3729,3828 %N A135454 Number of sums payable using exactly n banknotes of denominations 1, 5, 10, 20, 50, 100. %e A135454 n=1: 6 payable sums are 1,5,10,20,50,100; %e A135454 n=3: the 52 sums are in A135137. %K A135454 nonn %O A135454 0,2 %A A135454 _Zak Seidov_, Feb 16 2008 %E A135454 Corrected and extended by _Joshua Zucker_, Feb 16 2008