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 | 37 |
| 3 | 16987849 |
| 4 | 2416266949 |
| 5 | 5995229029 |
| 6 | 7193673829 |
| 7 | 11465419549 |
| 8 | 17783484529 |
| 9 | 72155530501 |
| 10 | 142013229529 |
| 11 | 174523785589 |
| 12 | 189282539137 |
| 13 | 294183810997 |
| 14 | 302690164297 |
| 15 | 354613312129 |
| 16 | 774557575609 |
| 17 | 933821938789 |
| 18 | 1407294504937 |
| 19 | 1974020768389 |
| 20 | 2112969494569 |
| 21 | 2878251281401 |