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 | 17 |
| 4 | 117 |
| 5 | 1413 |
| 6 | 46389 |
| 7 | 1211085 |
| 8 | 47977305 |
| 9 | 2302999889 |
| 10 | 137682614769 |
| 11 | 9844042388505 |
| 12 | 832087399629125 |