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 | 2 |
| 4 | -4 |
| 5 | 1 |
| 6 | 8 |
| 7 | -28 |
| 8 | 17 |
| 9 | -1 |
| 10 | 64 |
| 11 | -384 |
| 12 | 424 |
| 13 | -80 |
| 14 | 1 |
| 15 | 1024 |
| 16 | -10624 |
| 17 | 19400 |
| 18 | -7700 |
| 19 | 401 |
| 20 | -1 |
| 21 | 32768 |
| 22 | -598016 |
| 23 | 1748224 |
| 24 | -1225536 |
| 25 | 161618 |
| 26 | -2084 |
| 27 | 1 |
| 28 | 2097152 |
| 29 | -68550656 |
| 30 | 319410176 |
| 31 | -363159040 |
| 32 | 95891872 |