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 | 3 |
| 2 | 43 |
| 3 | 343 |
| 4 | 2343 |
| 5 | 72343 |
| 6 | 172343 |
| 7 | 5172343 |
| 8 | 65172343 |
| 9 | 565172343 |
| 10 | 1565172343 |
| 11 | 11565172343 |
| 12 | 511565172343 |
| 13 | 5511565172343 |
| 14 | 65511565172343 |
| 15 | 265511565172343 |
| 16 | 1265511565172343 |
| 17 | 31265511565172343 |
| 18 | 331265511565172343 |
| 19 | 3331265511565172343 |
| 20 | 43331265511565172343 |