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 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 196 |
| 4 | 2304 |
| 5 | 26896 |
| 6 | 313600 |
| 7 | 3655744 |
| 8 | 42614784 |
| 9 | 496754944 |
| 10 | 5790601216 |
| 11 | 67500196864 |
| 12 | 786839961600 |
| 13 | 9172078759936 |
| 14 | 106917585289216 |
| 15 | 1246322708463616 |
| 16 | 14528202160472064 |
| 17 | 169353135091941376 |
| 18 | 1974124812461670400 |
| 19 | 23012085209172803584 |