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 | 12 |
| 3 | 108 |
| 4 | 864 |
| 5 | 6480 |
| 6 | 46656 |
| 7 | 326592 |
| 8 | 2239488 |
| 9 | 15116544 |
| 10 | 100776960 |
| 11 | 665127936 |
| 12 | 4353564672 |
| 13 | 28298170368 |
| 14 | 182849716224 |
| 15 | 1175462461440 |
| 16 | 7522959753216 |
| 17 | 47958868426752 |
| 18 | 304679870005248 |
| 19 | 1929639176699904 |
| 20 | 12187194800209920 |
| 21 | 76779327241322496 |
| 22 | 482612914088312832 |