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 | 8 |
| 2 | 60 |
| 3 | 440 |
| 4 | 3200 |
| 5 | 23200 |
| 6 | 168000 |
| 7 | 1216000 |
| 8 | 8800000 |
| 9 | 63680000 |
| 10 | 460800000 |
| 11 | 3334400000 |
| 12 | 24128000000 |
| 13 | 174592000000 |
| 14 | 1263360000000 |
| 15 | 9141760000000 |
| 16 | 66150400000000 |
| 17 | 478668800000000 |
| 18 | 3463680000000000 |
| 19 | 25063424000000000 |