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 A115526 #2 Mar 30 2012 18:59:13 %S A115526 1,1,-1,1,0,1,1,0,1,-1,1,-1,0,0,1,1,-1,0,0,1,-1,1,0,1,0,0,0,1,1,0,1,0, %T A115526 0,0,1,-1,1,0,1,-1,0,0,0,0,1,1,0,1,-1,0,0,0,0,1,-1,1,-1,0,0,1,0,0,0,0, %U A115526 0,1,1,-1,0,0,1,0,0,0,0,0,1,-1,1,-1,0,0,1,-1,0,0,0,0,0,0,1,1,-1,0,0,1,-1,0,0,0,0,0,0,1,-1,1,0,1,0,0,0,1 %N A115526 Inverse of number triangle A115524. %C A115526 Row sums are number of zeros in binary expansion of n+2, that is, A023416(n+2) [conjecture]. %e A115526 Triangle begins %e A115526 1, %e A115526 1, -1, %e A115526 1, 0, 1, %e A115526 1, 0, 1, -1, %e A115526 1, -1, 0, 0, 1, %e A115526 1, -1, 0, 0, 1, -1, %e A115526 1, 0, 1, 0, 0, 0, 1, %e A115526 1, 0, 1, 0, 0, 0, 1, -1, %e A115526 1, 0, 1, -1, 0, 0, 0, 0, 1, %e A115526 1, 0, 1, -1, 0, 0, 0, 0, 1, -1, %e A115526 1, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, %e A115526 1, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, -1, %e A115526 1, -1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 1, %e A115526 1, -1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 1, -1, %e A115526 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, %e A115526 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, -1, %e A115526 1, 0, 1, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 1 %K A115526 sign,tabl %O A115526 0,1 %A A115526 _Paul Barry_, Jan 25 2006