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 | 3 |
| 2 | -3 |
| 3 | 1 |
| 4 | 12 |
| 5 | -29 |
| 6 | 30 |
| 7 | -15 |
| 8 | 3 |
| 9 | 55 |
| 10 | -222 |
| 11 | 405 |
| 12 | -417 |
| 13 | 252 |
| 14 | -84 |
| 15 | 12 |
| 16 | 273 |
| 17 | -1575 |
| 18 | 4203 |
| 19 | -6678 |
| 20 | 6846 |
| 21 | -4608 |
| 22 | 1980 |
| 23 | -495 |
| 24 | 55 |
| 25 | 1428 |
| 26 | -10812 |
| 27 | 38367 |
| 28 | -83244 |
| 29 | 121518 |
| 30 | -124146 |
| 31 | 89595 |
| 32 | -44990 |
| 33 | 15015 |
| 34 | -3003 |
| 35 | 273 |
| 36 | 7752 |
| 37 | -73017 |
| 38 | 325164 |