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) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 198 |
| 4 | 2309 |
| 5 | 25895 |
| 6 | 284217 |
| 7 | 3074048 |
| 8 | 32896079 |
| 9 | 349188532 |
| 10 | 11646890238 |
| 11 | 1171148874112 |
| 12 | 122278263238675 |
| 13 | 12727490844526758 |
| 14 | 1320830780128673820 |
| 15 | 136722265049041488664 |
| 16 | 14120912163801368446154 |
| 17 | 1455577353063960520275521 |
| 18 | 149780147487160167412789089 |