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 | 7 |
| 1 | 49 |
| 2 | 301 |
| 3 | 1813 |
| 4 | 10885 |
| 5 | 65317 |
| 6 | 391909 |
| 7 | 2351461 |
| 8 | 14108773 |
| 9 | 84652645 |
| 10 | 507915877 |
| 11 | 3047495269 |
| 12 | 18284971621 |
| 13 | 109709829733 |
| 14 | 658258978405 |
| 15 | 3949553870437 |
| 16 | 23697323222629 |
| 17 | 142183939335781 |
| 18 | 853103636014693 |
| 19 | 5118621816088165 |