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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 24 |
| 5 | 48 |
| 6 | 768 |
| 7 | 1536 |
| 8 | 36864 |
| 9 | 221184 |
| 10 | 3538944 |
| 11 | 7077888 |
| 12 | 2038431744 |
| 13 | 4076863488 |
| 14 | 65229815808 |
| 15 | 1043677052928 |
| 16 | 125241246351360 |
| 17 | 250482492702720 |
| 18 | 72138957898383360 |
| 19 | 144277915796766720 |
| 20 | 41552039749468815360 |
| 21 | 664832635991501045760 |
| 22 | 10637322175864016732160 |