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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 3265920 |
| 11 | 179625600 |
| 12 | 5568393600 |
| 13 | 128432304000 |
| 14 | 2458427811840 |
| 15 | 41355201888000 |
| 16 | 632788296940800 |
| 17 | 9008498667168000 |
| 18 | 121205358007493760 |
| 19 | 1558813928579107200 |
| 20 | 19326359087766057600 |
| 21 | 232491479092720848000 |
| 22 | 2727512837264447527680 |
| 23 | 31331281164921975283200 |
| 24 | 353549170783043484480000 |