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 | 2 |
| 3 | 8 |
| 4 | 64 |
| 5 | 768 |
| 6 | 12068 |
| 7 | 236926 |
| 8 | 5651384 |
| 9 | 160054952 |
| 10 | 5284391984 |
| 11 | 200375581984 |
| 12 | 8620342917808 |
| 13 | 416471882713712 |
| 14 | 22400989824444576 |
| 15 | 1331457489258580672 |
| 16 | 86887134810544955072 |
| 17 | 6189888588922841477824 |
| 18 | 478992737680928902742656 |
| 19 | 40082045451011806706919808 |
| 20 | 3612470757307682016196841216 |
| 21 | 349398857659776033845292636416 |