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 A114116 #2 Mar 30 2012 18:59:13 %S A114116 1,0,1,2,-1,1,-1,2,-1,1,1,0,1,-1,1,1,0,0,1,-1,1,3,-2,2,-1,1,-1,1,-2,3, %T A114116 -2,2,-1,1,-1,1,0,1,0,0,1,-1,1,-1,1,0,1,0,0,0,1,-1,1,-1,1,2,-1,2,-2,2, %U A114116 -1,1,-1,1,-1,1,0,1,-1,2,-2,2,-1,1,-1,1,-1,1,2,-1,1,0,0,0,1,-1,1,-1,1,-1,1,2,-1,1,0,0,0,0,1,-1,1,-1,1,-1,1,4,-3,3,-2,2 %N A114116 1's-counting matrix: row sums give number of 1's in binary expansion of n+1. %C A114116 First column is -A037861(n+1). Row sums are A000120. Product of partial sum matrix (1/(1-x),x) and A114115. Inverse is A114117. %e A114116 Triangle begins %e A114116 1; %e A114116 0, 1; %e A114116 2,-1, 1; %e A114116 -1, 2,-1, 1; %e A114116 1, 0, 1,-1, 1; %e A114116 1, 0, 0, 1,-1, 1; %e A114116 3,-2, 2,-1, 1,-1, 1; %K A114116 sign,tabl %O A114116 0,4 %A A114116 _Paul Barry_, Nov 13 2005