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 | 24 |
| 2 | 3456 |
| 3 | 7200 |
| 4 | 15000 |
| 5 | 57600 |
| 6 | 221184 |
| 7 | 867456 |
| 8 | 3402054 |
| 9 | 13630806 |
| 10 | 54613734 |
| 11 | 221152134 |
| 12 | 895530534 |
| 13 | 3642889494 |
| 14 | 14818750854 |
| 15 | 60456102318 |
| 16 | 246642942006 |
| 17 | 1008264289032 |
| 18 | 4121735121504 |
| 19 | 16864876108080 |
| 20 | 69005901096600 |