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 | 9 |
| 3 | 15 |
| 4 | 39 |
| 5 | 105 |
| 6 | 731 |
| 7 | 2805 |
| 8 | 59535 |
| 9 | 2658795 |
| 10 | 78060135 |
| 11 | 67554224745 |