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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 19 |
| 6 | 205 |
| 7 | 1795 |
| 8 | 36317 |
| 9 | 636331 |
| 10 | 23679901 |
| 11 | 805351531 |
| 12 | 56294206205 |
| 13 | 3735873535339 |
| 14 | 502757743028605 |
| 15 | 65725984337422795 |
| 16 | 17309316971673776957 |
| 17 | 4485620580863732681131 |