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 | 4 |
| 3 | 15 |
| 4 | 77 |
| 5 | 543 |
| 6 | 5005 |
| 7 | 58671 |
| 8 | 845879 |
| 9 | 14636427 |
| 10 | 297816383 |
| 11 | 7007621133 |
| 12 | 188075111317 |
| 13 | 5691796357357 |
| 14 | 192358193107653 |