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) |
|---|---|
| 0 | 1 |
| 1 | 224 |
| 2 | 29568 |
| 3 | 3010560 |
| 4 | 262090752 |
| 5 | 20558512128 |
| 6 | 1498264109056 |
| 7 | 103450998210560 |
| 8 | 6857541631868928 |
| 9 | 440486826671603712 |
| 10 | 27603867324502769664 |
| 11 | 1696189816779885772800 |
| 12 | 102592999712419955605504 |