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 | 5 |
| 3 | 7 |
| 4 | 35 |
| 5 | 135 |
| 6 | 899 |
| 7 | 10986 |
| 8 | 136967 |
| 9 | 3421139 |
| 10 | 111262773 |
| 11 | 5717068140 |
| 12 | 412501303097 |
| 13 | 44874896809668 |