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 | 0 |
| 1 | 5 |
| 2 | 31 |
| 3 | 41 |
| 4 | 31 |
| 5 | 61 |
| 6 | 3421 |
| 7 | 1 |
| 8 | 4127 |
| 9 | 43069 |
| 10 | 174941 |
| 11 | 854375 |
| 12 | 236366821 |
| 13 | 8553097 |
| 14 | 23749461899 |
| 15 | 8615841261683 |
| 16 | 7709321041727 |
| 17 | 2577687858361 |
| 18 | 26315271553055396563 |
| 19 | 2929993913841553 |
| 20 | 261082718496449135581 |