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 | 9 |
| 3 | 263 |
| 4 | 107080 |
| 5 | 250758892 |
| 6 | 5760755884032 |
| 7 | 958681588788944613 |
| 8 | 1369385680210307625221600 |