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 | 240 |
| 3 | 2016 |
| 4 | 15552 |
| 5 | 114048 |
| 6 | 808704 |
| 7 | 5598720 |
| 8 | 38071296 |
| 9 | 255301632 |
| 10 | 1693052928 |
| 11 | 11125776384 |
| 12 | 72559411200 |
| 13 | 470184984576 |
| 14 | 3030081011712 |
| 15 | 19434312695808 |
| 16 | 124128835928064 |
| 17 | 789910774087680 |
| 18 | 5010291195641856 |
| 19 | 31686706480545792 |