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 | -2 |
| 2 | 4 |
| 3 | -5 |
| 4 | 4 |
| 5 | 4 |
| 6 | -23 |
| 7 | 58 |
| 8 | -104 |
| 9 | 139 |
| 10 | -104 |
| 11 | -104 |
| 12 | 625 |
| 13 | -1562 |
| 14 | 2812 |
| 15 | -3749 |
| 16 | 2812 |
| 17 | 2812 |
| 18 | -16871 |
| 19 | 42178 |
| 20 | -75920 |
| 21 | 101227 |
| 22 | -75920 |
| 23 | -75920 |
| 24 | 455521 |
| 25 | -1138802 |
| 26 | 2049844 |
| 27 | -2733125 |
| 28 | 2049844 |
| 29 | 2049844 |
| 30 | -12299063 |
| 31 | 30747658 |
| 32 | -55345784 |
| 33 | 73794379 |
| 34 | -55345784 |
| 35 | -55345784 |