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 | 1 |
| 1 | 10 |
| 2 | 593 |
| 3 | 20412 |
| 4 | 268705 |
| 5 | 2012174 |
| 6 | 10609137 |
| 7 | 45136576 |
| 8 | 177264449 |
| 9 | 774840978 |
| 10 | 4486784401 |
| 11 | 33739007300 |
| 12 | 287589316833 |
| 13 | 2552470327702 |
| 14 | 22897453501745 |
| 15 | 205929575454024 |
| 16 | 1853088908328577 |
| 17 | 16677300287543066 |
| 18 | 150094833656289489 |