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 | 6 |
| 4 | 1 |
| 5 | 24 |
| 6 | 16 |
| 7 | 2 |
| 8 | 120 |
| 9 | 200 |
| 10 | 94 |
| 11 | 14 |
| 12 | 1 |
| 13 | 720 |
| 14 | 2400 |
| 15 | 2684 |
| 16 | 1284 |
| 17 | 310 |
| 18 | 36 |
| 19 | 2 |
| 20 | 5040 |
| 21 | 29400 |
| 22 | 63308 |
| 23 | 66158 |
| 24 | 38390 |
| 25 | 13037 |
| 26 | 2660 |
| 27 | 328 |
| 28 | 26 |
| 29 | 1 |