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 | 8 |
| 2 | 50 |
| 3 | 302 |
| 4 | 1814 |
| 5 | 10886 |
| 6 | 65318 |
| 7 | 391910 |
| 8 | 2351462 |
| 9 | 14108774 |
| 10 | 84652646 |
| 11 | 507915878 |
| 12 | 3047495270 |
| 13 | 18284971622 |
| 14 | 109709829734 |
| 15 | 658258978406 |
| 16 | 3949553870438 |
| 17 | 23697323222630 |
| 18 | 142183939335782 |
| 19 | 853103636014694 |