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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -6 |
| 8 | 11 |
| 9 | -6 |
| 10 | 1 |
| 11 | 0 |
| 12 | -2790 |
| 13 | 7467 |
| 14 | -7852 |
| 15 | 4300 |
| 16 | -1346 |
| 17 | 244 |
| 18 | -24 |
| 19 | 1 |
| 20 | 0 |
| 21 | -36586695600 |
| 22 | 132041735820 |
| 23 | -208601259660 |
| 24 | 194243767689 |
| 25 | -120509323400 |
| 26 | 53195294240 |
| 27 | -17371817260 |
| 28 | 4296667608 |
| 29 | -815202340 |
| 30 | 119111090 |
| 31 | -13339000 |
| 32 | 1127752 |
| 33 | -69860 |
| 34 | 3000 |
| 35 | -80 |
| 36 | 1 |