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) |
|---|---|
| 4 | 24 |
| 5 | 300 |
| 6 | 3360 |
| 7 | 38850 |
| 8 | 475776 |
| 9 | 6231960 |
| 10 | 87530400 |
| 11 | 1316954430 |
| 12 | 21173760960 |
| 13 | 362670636900 |
| 14 | 6596214691248 |
| 15 | 126980000240730 |
| 16 | 2579214238608000 |
| 17 | 55118036257959600 |
| 18 | 1235935135837111104 |
| 19 | 29009023670878484598 |