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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 270 |
| 4 | 3840 |
| 5 | 65625 |
| 6 | 1306368 |
| 7 | 29647548 |
| 8 | 754974720 |
| 9 | 21308126895 |
| 10 | 660000000000 |
| 11 | 22254310307658 |
| 12 | 811365140791296 |
| 13 | 31801886192186565 |
| 14 | 1333440819066961920 |
| 15 | 59553569091796875000 |
| 16 | 2822351843277561397248 |