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 | 1 |
| 2 | 5 |
| 3 | 1 |
| 4 | 31 |
| 5 | 1 |
| 6 | 41 |
| 7 | 1 |
| 8 | 31 |
| 9 | 1 |
| 10 | 61 |
| 11 | 1 |
| 12 | 3421 |
| 13 | 1 |
| 14 | -1 |
| 15 | 1 |
| 16 | 4127 |
| 17 | 1 |
| 18 | -43069 |
| 19 | 1 |
| 20 | 174941 |
| 21 | 1 |
| 22 | -854375 |
| 23 | 1 |
| 24 | 236366821 |
| 25 | 1 |
| 26 | -8553097 |
| 27 | 1 |
| 28 | 23749461899 |
| 29 | 1 |
| 30 | -8615841261683 |
| 31 | 1 |
| 32 | 7709321041727 |
| 33 | 1 |
| 34 | -2577687858361 |
| 35 | 1 |
| 36 | 26315271553055396563 |
| 37 | 1 |
| 38 | -2929993913841553 |
| 39 | 1 |