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 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | 2 |
| 4 | 6 |
| 5 | -5 |
| 6 | -17 |
| 7 | 12 |
| 8 | 48 |
| 9 | -28 |
| 10 | -135 |
| 11 | 63 |
| 12 | 378 |
| 13 | -134 |
| 14 | -1054 |
| 15 | 259 |
| 16 | 2927 |
| 17 | -408 |
| 18 | -8096 |
| 19 | 280 |
| 20 | 22305 |
| 21 | 1551 |
| 22 | -61210 |
| 23 | -10638 |
| 24 | 167310 |
| 25 | 46683 |
| 26 | -455489 |
| 27 | -175852 |
| 28 | 1234960 |
| 29 | 612380 |
| 30 | -3334215 |
| 31 | -2031953 |
| 32 | 8962498 |
| 33 | 6523626 |
| 34 | -23981046 |
| 35 | -20445373 |
| 36 | 63855135 |
| 37 | 62900496 |