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 | 1 |
| 2 | 60 |
| 3 | 728 |
| 4 | 6960 |
| 5 | 60512 |
| 6 | 97152 |
| 7 | 728000 |
| 8 | 1900080 |
| 9 | 2184000 |
| 10 | 4371840 |
| 11 | 26522496 |
| 12 | 843480000 |
| 13 | 23009688000 |
| 14 | 46352390400 |
| 15 | 93155148800 |
| 16 | 279465446400 |
| 17 | 701869363200 |
| 18 | 938948846080 |
| 19 | 1099176108032 |
| 20 | 2816846538240 |