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 | 151 |
| 1 | 373 |
| 2 | 95959 |
| 3 | 9515959 |
| 4 | 159595151 |
| 5 | 159595951 |
| 6 | 15151595951 |
| 7 | 15951595151 |
| 8 | 95951515159 |
| 9 | 1515159515951 |
| 10 | 1515959515951 |
| 11 | 1515959595151 |
| 12 | 1595159515151 |
| 13 | 1595159595151 |
| 14 | 9515151515159 |
| 15 | 9515159515159 |
| 16 | 9515159595959 |
| 17 | 9595159515959 |