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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 23 |
| 6 | 71 |
| 7 | 757 |
| 8 | 2559 |
| 9 | 30671 |
| 10 | 1383331 |
| 11 | 5003791 |
| 12 | 245273927 |
| 13 | 3362110459 |
| 14 | 12517624987 |
| 15 | 175179377183 |
| 16 | 9356953451851 |
| 17 | 509614686432899 |
| 18 | 1938763632210843 |
| 19 | 107752663194272623 |