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 | 1 |
| 2 | 4 |
| 3 | 45 |
| 4 | 968 |
| 5 | 34265 |
| 6 | 1799748 |
| 7 | 131572357 |
| 8 | 12770710096 |
| 9 | 1589142683313 |
| 10 | 246658484353100 |