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) |
|---|---|
| 0 | 792 |
| 1 | 13728 |
| 2 | 123552 |
| 3 | 772200 |
| 4 | 3775200 |
| 5 | 15402816 |
| 6 | 54609984 |
| 7 | 172931616 |
| 8 | 498841200 |
| 9 | 1330243200 |
| 10 | 3316739712 |
| 11 | 7801876368 |
| 12 | 17439488352 |
| 13 | 37263864000 |
| 14 | 76488984000 |
| 15 | 151448188320 |
| 16 | 290275694280 |
| 17 | 540192201120 |
| 18 | 978609060000 |
| 19 | 1729734435000 |
| 20 | 2988981103680 |
| 21 | 5058275713920 |