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 | 10 |
| 2 | 1 |
| 3 | 9 |
| 4 | 12 |
| 5 | 20 |
| 6 | 2430 |
| 7 | 5229 |
| 8 | 7448 |
| 9 | 282852 |
| 10 | 88200 |
| 11 | 8015040 |
| 12 | 200676960 |
| 13 | 2701775518 |
| 14 | 24655323238 |
| 15 | 15765750 |
| 16 | 1715313600 |
| 17 | 59049874884 |
| 18 | 1112489914536 |
| 19 | 14162129381400 |
| 20 | 135917876094000 |
| 21 | 1050596838951660 |
| 22 | 6832549561749912 |
| 23 | 38554260751029408 |
| 24 | 193081920969057120 |