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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 36 |
| 5 | 219 |
| 6 | 2778 |
| 7 | 87238 |
| 8 | 7310200 |
| 9 | 1729159267 |
| 10 | 1189189497342 |
| 11 | 2549864969632543 |
| 12 | 17220185517831384922 |
| 13 | 394769893681270492415501 |
| 14 | 30978809768092841795236288310 |
| 15 | 8707079257583213762665388798383646 |
| 16 | 9231279352362932208302062064694669246688 |