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 | 60 |
| 4 | 1248 |
| 5 | 8400 |
| 6 | 35520 |
| 7 | 114660 |
| 8 | 309120 |
| 9 | 731808 |
| 10 | 1569600 |
| 11 | 3114540 |
| 12 | 5802720 |
| 13 | 10261680 |
| 14 | 17367168 |
| 15 | 28310100 |
| 16 | 44674560 |
| 17 | 68527680 |
| 18 | 102522240 |
| 19 | 150012828 |
| 20 | 215186400 |
| 21 | 303208080 |
| 22 | 420383040 |
| 23 | 574335300 |
| 24 | 774204288 |
| 25 | 1030860000 |
| 26 | 1357137600 |
| 27 | 1768092300 |
| 28 | 2281275360 |
| 29 | 2917032048 |
| 30 | 3698822400 |