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 | 239 |
| 2 | 57121 |
| 3 | 4207089 |
| 4 | 129982953 |
| 5 | 2289596121 |
| 6 | 28017383049 |
| 7 | 268717054875 |
| 8 | 2171612995939 |
| 9 | 15433289999394 |
| 10 | 98940871306124 |
| 11 | 581277319267903 |
| 12 | 3162355311990371 |
| 13 | 16049547130078535 |