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 | 1 |
| 2 | 13 |
| 3 | 169 |
| 4 | 1890 |
| 5 | 20216 |
| 6 | 210824 |
| 7 | 2167819 |
| 8 | 22119495 |
| 9 | 224576508 |
| 10 | 2272476724 |
| 11 | 22940979719 |
| 12 | 231196075659 |
| 13 | 2326967290816 |
| 14 | 23397529216327 |
| 15 | 235077715264515 |
| 16 | 2360380831212204 |
| 17 | 23688221424314913 |
| 18 | 237630022857420415 |
| 19 | 2382971166402199310 |
| 20 | 23889590198849417292 |