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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -3 |
| 8 | 2 |
| 9 | 0 |
| 10 | 1 |
| 11 | -6 |
| 12 | 11 |
| 13 | -6 |
| 14 | 0 |
| 15 | 1 |
| 16 | -10 |
| 17 | 35 |
| 18 | -50 |
| 19 | 24 |
| 20 | 0 |
| 21 | 1 |
| 22 | -15 |
| 23 | 85 |
| 24 | -225 |
| 25 | 274 |
| 26 | -120 |
| 27 | 0 |
| 28 | 1 |
| 29 | -21 |
| 30 | 175 |
| 31 | -735 |
| 32 | 1624 |
| 33 | -1764 |
| 34 | 720 |
| 35 | 0 |
| 36 | 1 |
| 37 | -28 |
| 38 | 322 |
| 39 | -1960 |
| 40 | 6769 |
| 41 | -13132 |
| 42 | 13068 |
| 43 | -5040 |
| 44 | 0 |