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 | 2 |
| 4 | 10 |
| 5 | 131 |
| 6 | 3887 |
| 7 | 262555 |
| 8 | 42240104 |
| 9 | 16821037273 |
| 10 | 17094916187012 |
| 11 | 45374905859155948 |