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 | 3 |
| 2 | 7 |
| 3 | 32 |
| 4 | 135 |
| 5 | 597 |
| 6 | 2787 |
| 7 | 13374 |
| 8 | 66071 |
| 9 | 335895 |
| 10 | 1743974 |
| 11 | 9216391 |
| 12 | 49420750 |
| 13 | 268312356 |