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) |
|---|---|
| 7 | 3 |
| 8 | 26 |
| 9 | 1547 |
| 10 | 146487 |
| 11 | 16018987 |
| 12 | 1985766270 |
| 13 | 278601715904 |