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 | 3 |
| 2 | 8 |
| 3 | 68 |
| 4 | 2106 |
| 5 | 223776 |
| 6 | 80532200 |
| 7 | 98945392200 |
| 8 | 421225839051260 |
| 9 | 6310402120912239968 |
| 10 | 337401124757628967733136 |
| 11 | 65171905481441631827737564000 |
| 12 | 45944096973025484590366745753166436 |