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 | 24 |
| 5 | 48 |
| 6 | 120 |
| 7 | 240 |
| 8 | 840 |
| 9 | 1680 |
| 10 | 7560 |
| 11 | 15120 |
| 12 | 45360 |
| 13 | 83160 |
| 14 | 166320 |
| 15 | 498960 |
| 16 | 665280 |
| 17 | 1081080 |
| 18 | 2162160 |
| 19 | 6486480 |
| 20 | 8648640 |
| 21 | 17297280 |
| 22 | 36756720 |
| 23 | 110270160 |
| 24 | 147026880 |
| 25 | 294053760 |
| 26 | 698377680 |
| 27 | 2095133040 |
| 28 | 2793510720 |
| 29 | 5587021440 |
| 30 | 64250746560 |
| 31 | 128501493120 |
| 32 | 1606268664000 |