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 | 4712469842177 |
| 2 | 14192598568359611 |
| 3 | 389035682624908873 |
| 4 | 11713091929744317938 |
| 5 | 110566060844648951845 |