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 | 3 |
| 2 | 283 |
| 3 | 6793 |
| 4 | 22963 |
| 5 | 752023 |
| 6 | 2707163 |
| 7 | 44923183 |
| 8 | 44923183 |
| 9 | 961129823 |
| 10 | 1147752443 |
| 11 | 6879806623 |
| 12 | 131145172583 |
| 13 | 177746482483 |
| 14 | 795537219143 |
| 15 | 4028596340953 |
| 16 | 6987191424553 |
| 17 | 269013937530553 |
| 18 | 281659318133953 |
| 19 | 281659318133953 |