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 | 2 |
| 1 | 5 |
| 2 | 29 |
| 3 | 193 |
| 4 | 1733 |
| 5 | 17291 |
| 6 | 207367 |
| 7 | 2903041 |
| 8 | 43545611 |
| 9 | 696729629 |
| 10 | 12541132817 |
| 11 | 250822656001 |
| 12 | 5267275776047 |
| 13 | 115880067072017 |
| 14 | 2781121609728037 |
| 15 | 69528040243200079 |
| 16 | 1807729046323200001 |
| 17 | 48808684250726400031 |
| 18 | 1366643159020339200397 |