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 | -4 |
| 3 | 1 |
| 4 | 1 |
| 5 | -16 |
| 6 | 30 |
| 7 | -16 |
| 8 | 1 |
| 9 | 1 |
| 10 | -64 |
| 11 | 676 |
| 12 | -2752 |
| 13 | 4678 |
| 14 | -2752 |
| 15 | 676 |
| 16 | -64 |
| 17 | 1 |
| 18 | 1 |
| 19 | -256 |
| 20 | 13560 |
| 21 | -316160 |
| 22 | 3830300 |
| 23 | -25002240 |
| 24 | 87841480 |
| 25 | -180202240 |
| 26 | 227671110 |
| 27 | -180202240 |
| 28 | 87841480 |
| 29 | -25002240 |
| 30 | 3830300 |
| 31 | -316160 |
| 32 | 13560 |
| 33 | -256 |
| 34 | 1 |
| 35 | 1 |
| 36 | -1024 |