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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 155 |
| 4 | 3280 |
| 5 | 124511 |
| 6 | 7623993 |
| 7 | 795923016 |
| 8 | 140176308483 |
| 9 | 42642616703815 |