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 | 87 |
| 3 | 891 |
| 4 | 9513 |
| 5 | 104409 |
| 6 | 1165887 |
| 7 | 13155291 |
| 8 | 149353713 |
| 9 | 1701720009 |
| 10 | 19429431687 |
| 11 | 222100769691 |
| 12 | 2540606477913 |
| 13 | 29073358875609 |
| 14 | 332774973917487 |
| 15 | 3809447614844091 |
| 16 | 43611934023382113 |
| 17 | 499306241307571209 |