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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 59 |
| 7 | 285 |
| 8 | 1987 |
| 9 | 16057 |
| 10 | 149430 |
| 11 | 1551863 |
| 12 | 17747299 |
| 13 | 221015026 |