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) |
|---|---|
| 6 | 1 |
| 7 | 42 |
| 8 | 1008 |
| 9 | 18144 |
| 10 | 272160 |
| 11 | 3592512 |
| 12 | 43110144 |
| 13 | 480370176 |
| 14 | 5043886848 |
| 15 | 50438868480 |
| 16 | 484213137408 |
| 17 | 4489976365056 |
| 18 | 40409787285504 |
| 19 | 354362750042112 |
| 20 | 3037395000360960 |
| 21 | 25514118003032064 |
| 22 | 210491473525014528 |
| 23 | 1708695490967764992 |
| 24 | 13669563927742119936 |
| 25 | 107917609955858841600 |