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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 3 |
| 7 | 29 |
| 8 | 29 |
| 9 | 17 |
| 10 | 17 |
| 11 | 193 |
| 12 | 193 |
| 13 | -123 |
| 14 | -123 |
| 15 | -2687 |
| 16 | -2687 |
| 17 | -202863 |
| 18 | -202863 |
| 19 | -307072861 |
| 20 | -307072861 |
| 21 | -34827193 |
| 22 | -34827193 |
| 23 | -13759888463 |
| 24 | -13759888463 |
| 25 | -90168938889 |
| 26 | -90168938889 |
| 27 | -2200335979411 |
| 28 | -2200335979411 |
| 29 | -807090394867857 |
| 30 | -807090394867857 |
| 31 | -63216464619997641151 |