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 | -5 |
| 3 | 1 |
| 4 | 50 |
| 5 | -15 |
| 6 | 1 |
| 7 | -750 |
| 8 | 275 |
| 9 | -30 |
| 10 | 1 |
| 11 | 15000 |
| 12 | -6250 |
| 13 | 875 |
| 14 | -50 |
| 15 | 1 |
| 16 | -375000 |
| 17 | 171250 |
| 18 | -28125 |
| 19 | 2125 |
| 20 | -75 |
| 21 | 1 |
| 22 | 11250000 |
| 23 | -5512500 |
| 24 | 1015000 |
| 25 | -91875 |
| 26 | 4375 |
| 27 | -105 |
| 28 | 1 |
| 29 | -393750000 |
| 30 | 204187500 |
| 31 | -41037500 |
| 32 | 4230625 |