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.
{n}*2^n*hypergeometric1f1(3-n, -2*n, 2), where (a)'s wiki page.
{n}*2^n*hypergeometric1f1(3-n, -2*n, 2), where (a) has authored 0 sequences.