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 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 541 |
| 4 | 32761 |
| 5 | 3782521 |
| 6 | 570649861 |
| 7 | 126354119893 |
| 8 | 34059666142321 |
| 9 | 12697511966492401 |
| 10 | 5418397453551516541 |
| 11 | 2950382131846118771341 |
| 12 | 1848796902719228099999593 |
| 13 | 1394126061848631877574788201 |
| 14 | 1187817128863650862040235107701 |
| 15 | 1196980698779612997551160117313861 |