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 | 2 |
| 2 | 108 |
| 3 | 90040 |
| 4 | 1441534384 |
| 5 | 423657524608288 |
| 6 | 2303329608950881340608 |
| 7 | 231357371294195870227169041024 |
| 8 | 429425508267098531071850722486436668160 |