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 | 93 |
| 5 | 657 |
| 6 | 5063 |
| 7 | 41535 |
| 8 | 357205 |
| 9 | 3187599 |
| 10 | 29303687 |
| 11 | 276062807 |
| 12 | 2654603987 |