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) |
|---|---|
| 3 | 3 |
| 4 | 9 |
| 5 | 57 |
| 6 | 318 |
| 7 | 3090 |
| 8 | 24666 |
| 9 | 234879 |
| 10 | 2381481 |
| 11 | 26777922 |
| 12 | 324421053 |
| 13 | 4265966685 |