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) |
|---|---|
| 2 | 1 |
| 3 | 36 |
| 4 | 1 |
| 5 | 45 |
| 6 | 560 |
| 7 | 1 |
| 8 | 210 |
| 9 | 19600 |
| 10 | 4900 |
| 11 | 1 |
| 12 | 300 |
| 13 | 43680 |
| 14 | 513590 |
| 15 | 56448 |
| 16 | 1 |
| 17 | 378 |
| 18 | 45760 |
| 19 | 333833500 |
| 20 | 127008 |
| 21 | 4750 |
| 22 | 1 |
| 23 | 630 |
| 24 | 893200 |
| 25 | 711410700 |
| 26 | 259200 |
| 27 | 1926049000 |
| 28 | 58372180608 |
| 29 | 1 |