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]-1)>>1; (binomial($m<<1,$m) % $'s wiki page.
[0]-1)>>1; (binomial($m<<1,$m) % $ has authored 0 sequences.