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 | 7 |
| 2 | 85 |
| 3 | 1660 |
| 4 | 48076 |
| 5 | 1942416 |
| 6 | 104587344 |
| 7 | 7245893376 |
| 8 | 628308907776 |
| 9 | 66687811660800 |
| 10 | 8506654697548800 |
| 11 | 1284292319599411200 |
| 12 | 226530955276874956800 |
| 13 | 46165213716463676620800 |
| 14 | 10765453901922078105600000 |
| 15 | 2848453606917036402278400000 |
| 16 | 848800150518516674081587200000 |