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 | 16 |
| 4 | 216 |
| 5 | 14852 |
| 6 | 1994830 |
| 7 | 591482528 |
| 8 | 510948245264 |
| 9 | 1135318355003028 |
| 10 | 6257173857277450930 |