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 | 5 |
| 2 | 509 |
| 3 | 4397 |
| 4 | 42509 |
| 5 | 647417 |
| 6 | 647417 |
| 7 | 1248869 |
| 8 | 13175609 |
| 9 | 234946997 |
| 10 | 1039154933 |
| 11 | 7114719473 |
| 12 | 32021552837 |
| 13 | 32021552837 |
| 14 | 1237381737257 |
| 15 | 2904797643617 |
| 16 | 2904797643617 |
| 17 | 2904797643617 |