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 | 9 |
| 2 | 97 |
| 3 | 1233 |
| 4 | 18209 |
| 5 | 308129 |
| 6 | 5901489 |
| 7 | 126560849 |
| 8 | 3010775745 |
| 9 | 78805945665 |
| 10 | 2253470828561 |
| 11 | 69959985025841 |
| 12 | 2345132738183841 |
| 13 | 84468280694319713 |
| 14 | 3254988169237833585 |
| 15 | 133676275015986223569 |
| 16 | 5830402582814375609729 |
| 17 | 269227430712934320151169 |