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 | 4 |
| 2 | 5071 |
| 3 | 6313 |
| 4 | 31591 |
| 5 | 9853 |
| 6 | 11733 |
| 7 | 31865 |
| 8 | 736481 |
| 9 | 9834802 |
| 10 | 5123383 |
| 11 | 906334841 |
| 12 | 312395329 |
| 13 | 73044385753 |
| 14 | 39216355244851 |
| 15 | 353123779923181 |
| 16 | 944016528715333 |
| 17 | 901870160743125919 |
| 18 | 3394064622591216338731 |
| 19 | 798539095539570459224764519 |
| 20 | 5844680137439021618014007903 |