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 | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 302 |
| 5 | 391232 |
| 6 | 912140731560 |
| 7 | 6870302396056798235043564 |
| 8 | 552249828443015013351729477795257932661645918815144 |