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 | 5 |
| 2 | 70 |
| 3 | 1512 |
| 4 | 33150 |
| 5 | 842688 |
| 6 | 34594560 |
| 7 | 1705017600 |
| 8 | 68981673600 |
| 9 | 3038555520000 |
| 10 | 212396207063040 |
| 11 | 16628926183833600 |
| 12 | 985240084758930000 |
| 13 | 61949330611480166400 |
| 14 | 6155242080686899200000 |
| 15 | 445283762978503737288000 |