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 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 98 |
| 5 | 1300 |
| 6 | 20515 |
| 7 | 376761 |
| 8 | 7907396 |
| 9 | 186884496 |
| 10 | 4914341925 |
| 11 | 142364319625 |
| 12 | 4505856912854 |
| 13 | 154718778284148 |
| 14 | 5729082486784839 |
| 15 | 227584583172284625 |
| 16 | 9654782997596059912 |
| 17 | 435659030617933827136 |
| 18 | 20836030169620907691465 |