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 | 13 |
| 2 | 71 |
| 3 | 1806113 |
| 4 | 2699538733 |
| 5 | 568972471024107865287021434301977158534824481 |
| 6 | 5926187589691497537793497756719 |