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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 60 |
| 6 | 120 |
| 7 | 840 |
| 8 | 1680 |
| 9 | 15120 |
| 10 | 30240 |
| 11 | 332640 |
| 12 | 665280 |
| 13 | 8648640 |
| 14 | 17297280 |
| 15 | 259459200 |
| 16 | 518918400 |
| 17 | 8821612800 |
| 18 | 17643225600 |
| 19 | 335221286400 |
| 20 | 670442572800 |
| 21 | 14079294028800 |
| 22 | 28158588057600 |
| 23 | 647647525324800 |
| 24 | 1295295050649600 |