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.
0_0..._0, and distinct blocks of length 2n-1 are of the form 0_0's wiki page.
0_0..._0, and distinct blocks of length 2n-1 are of the form 0_0 has authored 0 sequences.