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 | 5 |
| 2 | 198 |
| 3 | 63206 |
| 4 | 163170556 |
| 5 | 3410501048325 |
| 6 | 577465332522075000 |
| 7 | 792313244775191409073200 |
| 8 | 8810729389390415079342840510816 |