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 | 1 |
| 3 | 5 |
| 4 | 85 |
| 5 | 341 |
| 6 | 5461 |
| 7 | 21845 |
| 8 | 349525 |
| 9 | 22369621 |
| 10 | 89478485 |
| 11 | 5726623061 |
| 12 | 91625968981 |
| 13 | 366503875925 |
| 14 | 5864062014805 |
| 15 | 375299968947541 |
| 16 | 24019198012642645 |
| 17 | 96076792050570581 |
| 18 | 6148914691236517205 |