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 | 6 |
| 3 | 37 |
| 4 | 305 |
| 5 | 3231 |
| 6 | 42757 |
| 7 | 687255 |
| 8 | 13115039 |
| 9 | 291562263 |
| 10 | 7437080225 |
| 11 | 214937130141 |
| 12 | 6964398942275 |
| 13 | 250747967052627 |