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 A111982 #2 Mar 30 2012 18:59:12 %S A111982 1,1,2,3,2,4,2,5,2,4,2,6,2,4,2,7,2,4,2,6,2,4,2,8,2,4,2,6,2,4,2,9,2,4, %T A111982 2,6,2,4,2,8,2,4,2,6,2,4,2,10,2,4,2,6,2,4,2,8,2,4,2,6,2,4,2,11,2,4,2, %U A111982 6,2,4,2,8,2,4,2,6,2,4,2,10,2,4,2,6,2,4,2,8,2,4,2,6,2,4,2,12,2,4,2,6,2 %N A111982 Row sums of abs(A111967). %C A111982 mod(a(n),2)=A036987(n). a(2^n-1)=2n-1+2*0^n; a(2^n)=2-0^n. %K A111982 easy,nonn %O A111982 0,3 %A A111982 _Paul Barry_, Aug 24 2005