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 | 300 |
| 4 | 5100 |
| 5 | 109692 |
| 6 | 2854344 |
| 7 | 87164088 |
| 8 | 3055516800 |
| 9 | 120916282368 |
| 10 | 5331444120576 |
| 11 | 259168711406976 |
| 12 | 13769882994784896 |
| 13 | 793844510730348672 |
| 14 | 49353915922852214016 |
| 15 | 3291455140392403401984 |
| 16 | 234388011123877880424960 |
| 17 | 17750517946502792294592000 |