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 | 168 |
| 3 | 11232 |
| 4 | 86016 |
| 5 | 1488000 |
| 6 | 1886976 |
| 7 | 33784128 |
| 8 | 44040192 |
| 9 | 221079456 |
| 10 | 249984000 |
| 11 | 2124276000 |
| 12 | 966131712 |
| 13 | 9726417792 |
| 14 | 5675733504 |
| 15 | 16713216000 |
| 16 | 22548578304 |
| 17 | 111203278848 |
| 18 | 37141348608 |
| 19 | 304812862560 |
| 20 | 127991808000 |