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 | 9 |
| 1 | 19 |
| 2 | 66 |
| 3 | 217 |
| 4 | 500 |
| 5 | 9217 |
| 6 | 18934 |
| 7 | 66019 |
| 8 | 216991 |
| 9 | 500001 |
| 10 | 9217009 |
| 11 | 18934019 |
| 12 | 66019066 |
| 13 | 216991217 |
| 14 | 500001500 |
| 15 | 9217018217 |
| 16 | 18934037934 |
| 17 | 66019132019 |
| 18 | 216991433991 |
| 19 | 500002000001 |
| 20 | 9217027434009 |
| 21 | 18934056868019 |
| 22 | 66019198038066 |
| 23 | 216991650982217 |
| 24 | 500002500002500 |