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 A059920 #3 Mar 31 2012 20:02:00 %S A059920 10,1,20,1,10,30,1,2,11,40,1,2,10,20,50,1,2,3,11,21,60,1,2,3,10,12,30, %T A059920 70,1,2,3,4,11,20,31,80,1,2,3,4,10,12,21,40,90,1,2,3,4,5,11,13,22,41, %U A059920 100,1,2,3,4,5,10,12,20,30,50,110,1,2,3,4,5,6,11,13,21,31,51,120,1,2,3 %N A059920 If m/n = q + r/n (r < n, n,m >=1), then array a(m,n) = qr (meaning q followed by r). Read by antidiagonals. %e A059920 a(7,3)=21 because 7/3=2+1/3; a(273,24)=119 because 273/24=11+9/24. %e A059920 Array begins %e A059920 10 20 30 40 50... %e A059920 1 10 11 20 21 ... %e A059920 1 2 10 11 ... %K A059920 base,easy,tabl,nonn %O A059920 1,1 %A A059920 _Fabian Rothelius_, Feb 09 2001