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 | 9 |
| 2 | 244 |
| 3 | 9065 |
| 4 | 389376 |
| 5 | 18188478 |
| 6 | 897376152 |
| 7 | 46011772521 |
| 8 | 2427553965160 |
| 9 | 130930630643384 |
| 10 | 7186614533569296 |
| 11 | 400132290102421214 |
| 12 | 22543708920891189136 |
| 13 | 1282873288801683197250 |
| 14 | 73628947696550668509744 |
| 15 | 4257138240245923453355625 |
| 16 | 247733479854085081062353400 |