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 | 4 |
| 2 | 3 |
| 3 | 11 |
| 4 | 131 |
| 5 | 17291 |
| 6 | 298995971 |
| 7 | 89398590973228811 |
| 8 | 7992108067998667938125889533702531 |
| 9 | 63873791370569400659097694858350356285036046451665934814399129508491 |