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 | 9 |
| 2 | 36 |
| 3 | 3969 |
| 4 | 69696 |
| 5 | 93636 |
| 6 | 3663396 |
| 7 | 9696996 |
| 8 | 966339396 |
| 9 | 6693366969 |
| 10 | 36333696996 |
| 11 | 63396693369 |
| 12 | 96693633936 |
| 13 | 33993333636639339663936 |
| 14 | 399339393339639693369636 |
| 15 | 9936969933633699966996996 |
| 16 | 396693636699939696999339663969 |
| 17 | 6636966336636339969666396999936 |
| 18 | 339666666363999366939366969366969936633336969 |