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 | 394 |
| 3 | 122601 |
| 4 | 8510140 |
| 5 | 210940745 |
| 6 | 2524556538 |
| 7 | 17167621086 |
| 8 | 72787256640 |
| 9 | 202996629360 |
| 10 | 382918536000 |
| 11 | 492133561920 |
| 12 | 424994169600 |
| 13 | 236107872000 |
| 14 | 76281004800 |
| 15 | 10897286400 |