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 | 0 |
| 2 | 2 |
| 3 | 266 |
| 4 | 19750 |
| 5 | 1673658 |
| 6 | 251740932 |
| 7 | 90752836672 |
| 8 | 93037538287080 |
| 9 | 293564184229043556 |
| 10 | 2953569640505846392444 |