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 A022827 #5 Mar 30 2012 18:55:51 %S A022827 1,1,0,1,0,0,1,1,1,1,0,1,2,0,1,3,2,2,1,0,1,1,2,0,0,2,2,1,0,0,1,3,4,4, %T A022827 3,1,0,0,1,1,2,2,1,0,0,2,1,1,3,3,2,1,0,0,1,1,2,2,1,0,1,1,1,5,4,4,3,2, %U A022827 1,3,2,4,3,3,3,2,1,1,0,2,2,0,1,2,1,1,0,0,1,1,4,1,2,2,1,1,2,4,4 %N A022827 a(n) = absolute value of ( a([ n/2 ]) - a([ n/3 ]) + ... + ((-1)^n)a([ n/n ]) ). %K A022827 nonn %O A022827 0,13 %A A022827 _Clark Kimberling_