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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | -1 |
| 6 | -2 |
| 7 | 1 |
| 8 | 2 |
| 9 | -1 |
| 10 | -3 |
| 11 | 2 |
| 12 | 9 |
| 13 | -7 |
| 14 | -40 |
| 15 | 33 |
| 16 | 224 |
| 17 | -191 |
| 18 | -1495 |
| 19 | 1304 |
| 20 | 11545 |
| 21 | -10241 |
| 22 | -101106 |
| 23 | 90865 |
| 24 | 989274 |
| 25 | -898409 |
| 26 | -10690043 |
| 27 | 9791634 |
| 28 | 126392833 |
| 29 | -116601199 |
| 30 | -1622625152 |
| 31 | 1506023953 |
| 32 | 22473758096 |
| 33 | -20967734143 |
| 34 | -333977722335 |
| 35 | 313009988192 |
| 36 | 5300202065121 |
| 37 | -4987192076929 |