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 | 11 |
| 3 | 253 |
| 4 | 11891 |
| 5 | 77209 |
| 6 | 768361 |
| 7 | 1775807 |
| 8 | 17666737 |
| 9 | 36112967 |
| 10 | 61488361 |
| 11 | 83462929 |
| 12 | 154261943 |
| 13 | 173185331 |
| 14 | 591303757 |
| 15 | 830336639 |
| 16 | 971656873 |
| 17 | 2936791979 |
| 18 | 4139054953 |
| 19 | 5393125859 |
| 20 | 8139710557 |
| 21 | 8142849781 |
| 22 | 45667873031 |
| 23 | 53653880269 |