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 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 162 |
| 5 | 3072 |
| 6 | 62500 |
| 7 | 1399680 |
| 8 | 34588806 |
| 9 | 939524096 |
| 10 | 27894275208 |
| 11 | 900000000000 |
| 12 | 31384283767210 |
| 13 | 1176925259169792 |
| 14 | 47248516628391468 |
| 15 | 2022385242251558912 |
| 16 | 91957716979980468750 |
| 17 | 4427218577690292387840 |
| 18 | 225009351233083599856144 |
| 19 | 12040000871040740498079744 |