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 | 2 |
| 2 | 9 |
| 3 | 97 |
| 4 | 2689 |
| 5 | 214017 |
| 6 | 53130241 |
| 7 | 43283609601 |
| 8 | 119521939222529 |
| 9 | 1144341237628100609 |
| 10 | 38638551719263573098497 |
| 11 | 4662529388979590206324834305 |
| 12 | 2032489532637330252763496597356545 |