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) |
|---|---|
| 0 | 3 |
| 1 | 13 |
| 2 | 233 |
| 3 | 70673 |
| 4 | 6068414753 |
| 5 | 41437343632855438913 |
| 6 | 1802124039077579799678906531623816674433 |
| 7 | 3276599074530619413746235255317178710800049247052611689171540483148625798281473 |