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 | 72 |
| 2 | 3456 |
| 3 | 746496 |
| 4 | 214990848 |
| 5 | 1719926784 |
| 6 | 743008370688 |
| 7 | 53496602689536 |
| 8 | 10271347716390912 |
| 9 | 6655833320221310976 |
| 10 | 958439998111868780544 |
| 11 | 23002559954684850733056 |