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.
q)! }; here, the q-factorial of n is denoted by ([n]_q)! = Product's wiki page.
q)! }; here, the q-factorial of n is denoted by ([n]_q)! = Product has authored 0 sequences.