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 | 0 |
| 2 | 0 |
| 3 | 49536 |
| 4 | 7067600 |
| 5 | 71450504 |
| 6 | 288493336 |
| 7 | 741624088 |
| 8 | 1474319716 |
| 9 | 2497432760 |
| 10 | 3806665836 |
| 11 | 5395343360 |
| 12 | 7259273932 |
| 13 | 9396774760 |
| 14 | 11807403172 |
| 15 | 14491089616 |
| 16 | 17447829164 |
| 17 | 20677621816 |
| 18 | 24180467572 |
| 19 | 27956366432 |
| 20 | 32005318396 |
| 21 | 36327323464 |