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 | 3 |
| 3 | 9 |
| 4 | 69 |
| 5 | 429 |
| 6 | 4089 |
| 7 | 86529 |
| 8 | 513099 |
| 9 | 913569 |
| 10 | 7914339 |
| 11 | 6593621379 |
| 12 | 9366241599 |
| 13 | 456246278469 |
| 14 | 4565283812559 |