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 A022830 #4 Mar 30 2012 18:55:51 %S A022830 1,0,1,0,1,1,2,0,2,2,3,2,3,3,6,2,3,5,6,5,8,8,9,5,7,7,11,10,11,15,16,8, %T A022830 11,11,14,16,17,17,20,16,17,21,22,21,29,29,30,18,20,22,25,24,25,33,36, %U A022830 32,35,35,36,41,42,42,50,34,37,41,42,41,44,48,49,47,48,48,56 %N A022830 a(n) = -[ n/2 ] + a([ n/2 ]) + a([ n/3 ]) + . . . + a([ n/n ]). %K A022830 nonn %O A022830 0,7 %A A022830 _Clark Kimberling_