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 | 4 |
| 3 | 36 |
| 4 | 48 |
| 5 | 180 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 20160 |
| 9 | 25200 |
| 10 | 45360 |
| 11 | 50400 |
| 12 | 498960 |
| 13 | 665280 |
| 14 | 3603600 |
| 15 | 6486480 |
| 16 | 7207200 |
| 17 | 8648640 |
| 18 | 14414400 |
| 19 | 32432400 |
| 20 | 110270160 |
| 21 | 698377680 |
| 22 | 2095133040 |
| 23 | 2205403200 |
| 24 | 41902660800 |
| 25 | 73329656400 |
| 26 | 146659312800 |
| 27 | 240940299600 |
| 28 | 293318625600 |
| 29 | 963761198400 |