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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 11 |
| 8 | 131 |
| 9 | 17291 |
| 10 | 298995971 |
| 11 | 29799530324409601 |
| 12 | 80728364323218860837749108564353 |
| 13 | 49748616842002716055120167595193322161740083228987208037683201 |