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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 4 |
| 3 | 13 |
| 4 | 61 |
| 5 | 361 |
| 6 | 2521 |
| 7 | 20161 |
| 8 | 181441 |
| 9 | 1814401 |
| 10 | 19958401 |
| 11 | 239500801 |
| 12 | 3353011202 |
| 13 | 50295168017 |