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 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | -1 |
| 7 | 1 |
| 8 | 4 |
| 9 | -10 |
| 10 | 17 |
| 11 | -25 |
| 12 | -1 |
| 13 | 76 |
| 14 | -217 |
| 15 | 443 |
| 16 | -490 |
| 17 | -94 |
| 18 | 1999 |
| 19 | -6208 |
| 20 | 11527 |
| 21 | -12350 |
| 22 | -4471 |
| 23 | 63826 |
| 24 | -184055 |
| 25 | 332713 |
| 26 | -342399 |
| 27 | -231390 |
| 28 | 2101215 |
| 29 | -5790892 |
| 30 | 10230983 |
| 31 | -9625472 |
| 32 | -10237792 |
| 33 | 71714387 |
| 34 | -190381165 |
| 35 | 324440310 |
| 36 | -275119412 |
| 37 | -430340403 |