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.
) && vecall { (($n-1)>>1) % ($'s wiki page.
) && vecall { (($n-1)>>1) % ($ has authored 0 sequences.