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 | 6 |
| 3 | 10 |
| 4 | 2 |
| 5 | 22 |
| 6 | 288 |
| 7 | 2 |
| 8 | 52 |
| 9 | 32 |
| 10 | 4 |
| 11 | 32 |
| 12 | 21600 |
| 13 | 18 |
| 14 | 540360 |
| 15 | 34528 |
| 16 | 100406 |
| 17 | 70266144 |
| 18 | 1380216154 |
| 19 | 1682689266 |
| 20 | 77900162 |
| 21 | 233645826 |
| 22 | 200997249200 |