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 | 4 |
| 2 | 24 |
| 3 | 96 |
| 4 | 1920 |
| 5 | 6144 |
| 6 | 122880 |
| 7 | 393216 |
| 8 | 7864320 |
| 9 | 528482304 |
| 10 | 1610612736 |
| 11 | 135291469824 |
| 12 | 2061584302080 |
| 13 | 6597069766656 |
| 14 | 131941395333120 |
| 15 | 8866461766385664 |
| 16 | 567453553048682496 |
| 17 | 1729382256910270464 |
| 18 | 145268109580462718976 |
| 19 | 2213609288845146193920 |