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 | 24 |
| 2 | 324 |
| 3 | 7500 |
| 4 | 57624 |
| 5 | 878460 |
| 6 | 2399124 |
| 7 | 12027024 |
| 8 | 23457780 |
| 9 | 73878024 |
| 10 | 297058020 |
| 11 | 443290080 |
| 12 | 1281926124 |
| 13 | 2373639240 |
| 14 | 3158972124 |
| 15 | 5387167824 |
| 16 | 11078235324 |
| 17 | 21084208140 |
| 18 | 25753264260 |
| 19 | 45219115524 |
| 20 | 64037436120 |
| 21 | 75652914024 |