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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -6 |
| 8 | -27 |
| 9 | -83 |
| 10 | -209 |
| 11 | -461 |
| 12 | -922 |
| 13 | -1702 |
| 14 | -2911 |
| 15 | -4549 |
| 16 | -6187 |
| 17 | -6187 |
| 18 | 0 |
| 19 | 23238 |
| 20 | 87021 |
| 21 | 238337 |
| 22 | 564719 |
| 23 | 1217483 |
| 24 | 2434966 |
| 25 | 4542526 |
| 26 | 7865521 |
| 27 | 12403951 |
| 28 | 16942381 |
| 29 | 16942381 |
| 30 | 0 |
| 31 | -63239286 |
| 32 | -236031147 |
| 33 | -644886923 |
| 34 | -1525870529 |
| 35 | -3287837741 |
| 36 | -6575675482 |