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 | 3 |
| 2 | 15 |
| 3 | 121 |
| 4 | 1365 |
| 5 | 19531 |
| 6 | 335923 |
| 7 | 6725601 |
| 8 | 153391689 |
| 9 | 3922632451 |
| 10 | 111111111111 |
| 11 | 3452271214393 |
| 12 | 116719860413533 |
| 13 | 4265491084507563 |
| 14 | 167534872139182395 |
| 15 | 7037580381120954241 |
| 16 | 314824432191309680913 |
| 17 | 14942027230321957802947 |