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 | 18 |
| 3 | 250 |
| 4 | 3168 |
| 5 | 38524 |
| 6 | 459000 |
| 7 | 5411224 |
| 8 | 63436032 |
| 9 | 741418000 |
| 10 | 8651257632 |
| 11 | 100857705376 |
| 12 | 1175245632000 |
| 13 | 13690951178176 |
| 14 | 159468944439168 |
| 15 | 1857310612720000 |
| 16 | 21630889140461568 |
| 17 | 251915019187028224 |