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 | 10 |
| 2 | 60 |
| 3 | 600 |
| 4 | 3600 |
| 5 | 36000 |
| 6 | 216000 |
| 7 | 2160000 |
| 8 | 12960000 |
| 9 | 129600000 |
| 10 | 777600000 |
| 11 | 7776000000 |
| 12 | 46656000000 |
| 13 | 466560000000 |
| 14 | 2799360000000 |
| 15 | 27993600000000 |
| 16 | 167961600000000 |
| 17 | 1679616000000000 |
| 18 | 10077696000000000 |
| 19 | 100776960000000000 |
| 20 | 604661760000000000 |