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 | 15 |
| 4 | 35 |
| 5 | 219 |
| 6 | 1243 |
| 7 | 7492 |
| 8 | 54303 |
| 9 | 436934 |
| 10 | 3878931 |