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 | 41 |
| 4 | 308 |
| 5 | 2465 |
| 6 | 20542 |
| 7 | 176075 |
| 8 | 1540657 |
| 9 | 13694729 |
| 10 | 1232525611 |
| 11 | 11204778282 |
| 12 | 1027104675851 |
| 13 | 9480966238625 |
| 14 | 880375436443751 |
| 15 | 8216837406808343 |
| 16 | 77032850688828216 |
| 17 | 725015065306618504 |
| 18 | 68473645056736192045 |