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 | 2 |
| 2 | 6 |
| 3 | 30 |
| 4 | 6 |
| 5 | 210 |
| 6 | 6 |
| 7 | 2310 |
| 8 | 2730 |
| 9 | 30 |
| 10 | 39270 |
| 11 | 7410 |
| 12 | 42 |
| 13 | 7590 |
| 14 | 46410 |
| 15 | 1272810 |
| 16 | 30 |
| 17 | 930930 |
| 18 | 82110 |
| 19 | 6 |
| 20 | 21111090 |
| 21 | 1230 |
| 22 | 48969690 |