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 | 1 |
| 2 | 4 |
| 3 | 45 |
| 4 | 80 |
| 5 | 28974 |
| 6 | 28974 |
| 7 | 8489103 |
| 8 | 80314575 |
| 9 | 5196065775 |
| 10 | 77506573550 |
| 11 | 166622964149389 |
| 12 | 489289301397948 |