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 | 27 |
| 3 | 141 |
| 4 | 837 |
| 5 | 5757 |
| 6 | 45357 |
| 7 | 403197 |
| 8 | 3991677 |
| 9 | 43545597 |
| 10 | 518918397 |
| 11 | 6706022397 |
| 12 | 93405311997 |
| 13 | 1394852659197 |
| 14 | 22230464255997 |
| 15 | 376610217983997 |
| 16 | 6758061133823997 |
| 17 | 128047474114559997 |
| 18 | 2554547108585471997 |