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 | 0 |
| 2 | 7890481 |
| 3 | 9150625 |
| 4 | 623201296 |
| 5 | 981506241 |
| 6 | 17363069361 |
| 7 | 18945044881 |
| 8 | 28813025536 |
| 9 | 33871089681 |
| 10 | 38167092496 |
| 11 | 45954068161 |
| 12 | 89526025681 |
| 13 | 95565066496 |
| 14 | 1421970391296 |
| 15 | 1551160647936 |
| 16 | 1736870953216 |
| 17 | 3941340648961 |
| 18 | 4771970346256 |
| 19 | 5281980641536 |
| 20 | 5436960129441 |