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,j=0,...,n} with f(r,k) = sum's wiki page.
{i,j=0,...,n} with f(r,k) = sum has authored 0 sequences.