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 | 7 |
| 3 | 227 |
| 4 | 9130 |
| 5 | 408081 |
| 6 | 19274998 |
| 7 | 946866202 |
| 8 | 47865420384 |
| 9 | 2473743947058 |