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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 9 |
| 5 | 6 |
| 6 | 1 |
| 7 | 49 |
| 8 | 288 |
| 9 | 174 |
| 10 | 1 |
| 11 | 225 |
| 12 | 6750 |
| 13 | 36000 |
| 14 | 22560 |
| 15 | 1 |
| 16 | 961 |
| 17 | 118800 |
| 18 | 3159750 |
| 19 | 17760600 |
| 20 | 12514320 |
| 21 | 1 |
| 22 | 3969 |
| 23 | 1807806 |
| 24 | 190071000 |
| 25 | 5295204600 |
| 26 | 34395777360 |
| 27 | 28836612000 |
| 28 | 1 |
| 29 | 16129 |
| 30 | 25316928 |
| 31 | 9271660734 |
| 32 | 1001080231200 |
| 33 | 32307576315840 |