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 | 720 |
| 2 | 19 |
| 3 | 147 |
| 4 | 1015 |
| 5 | 15171 |
| 6 | 255437 |
| 7 | 4893787 |
| 8 | 100710495 |
| 9 | 2166450939 |