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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 3 |
| 7 | -8 |
| 8 | 14 |
| 9 | 1 |
| 10 | -49 |
| 11 | 144 |
| 12 | -162 |
| 13 | -139 |
| 14 | 1159 |
| 15 | -2532 |
| 16 | 2036 |
| 17 | 6062 |
| 18 | -26282 |
| 19 | 47440 |
| 20 | -11474 |
| 21 | -190071 |
| 22 | 606163 |
| 23 | -838984 |
| 24 | -481092 |
| 25 | 5479390 |
| 26 | -13618658 |
| 27 | 13030368 |
| 28 | 28786262 |
| 29 | -148598623 |
| 30 | 294393355 |
| 31 | -128639411 |
| 32 | -1086088045 |
| 33 | 3848604261 |
| 34 | -5935686369 |
| 35 | -1750697623 |