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 | 3 |
| 2 | 19 |
| 3 | 193 |
| 4 | 2721 |
| 5 | 49171 |
| 6 | 1084483 |
| 7 | 28245729 |
| 8 | 848456353 |
| 9 | 28875761731 |
| 10 | 1098127402131 |
| 11 | 46150226651233 |
| 12 | 2124008553358849 |
| 13 | 106246577894593683 |
| 14 | 5739439214861417731 |
| 15 | 332993721039856822081 |
| 16 | 20651350143685984386753 |