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 | 12 |
| 2 | 24 |
| 3 | 84 |
| 4 | 120 |
| 5 | 270 |
| 6 | 672 |
| 7 | 1488 |
| 8 | 1638 |
| 9 | 6200 |
| 10 | 24384 |
| 11 | 174592 |
| 12 | 523776 |
| 13 | 44736512 |
| 14 | 91963648 |
| 15 | 100651008 |
| 16 | 459818240 |
| 17 | 1476304896 |
| 18 | 10200236032 |
| 19 | 25769607168 |
| 20 | 51001180160 |
| 21 | 412316073984 |