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 | 17 |
| 4 | 89 |
| 5 | 589 |
| 6 | 3833 |
| 7 | 27940 |
| 8 | 211439 |
| 9 | 1653257 |
| 10 | 13283194 |
| 11 | 109058142 |
| 12 | 911411528 |
| 13 | 7731354496 |