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 | 1600 |
| 7 | 389312 |
| 8 | 22057472 |
| 9 | 565532992 |
| 10 | 8611750848 |
| 11 | 90564534336 |
| 12 | 720227187456 |
| 13 | 4603893554496 |
| 14 | 24675964279680 |
| 15 | 114402835995392 |
| 16 | 469601097840640 |
| 17 | 1737913582100864 |
| 18 | 5882030372643968 |
| 19 | 18417596366384512 |
| 20 | 53854324059153920 |
| 21 | 148209412582029184 |
| 22 | 386390343290393024 |
| 23 | 959556901097413696 |