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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -3 |
| 9 | 3 |
| 10 | 0 |
| 11 | 0 |
| 12 | 3 |
| 13 | -8 |
| 14 | 6 |
| 15 | 0 |
| 16 | 1 |
| 17 | -8 |
| 18 | 28 |
| 19 | -40 |
| 20 | 20 |
| 21 | 0 |
| 22 | 0 |
| 23 | 6 |
| 24 | -40 |
| 25 | 105 |
| 26 | -120 |
| 27 | 50 |
| 28 | 0 |
| 29 | 1 |
| 30 | -15 |
| 31 | 105 |
| 32 | -355 |
| 33 | 615 |
| 34 | -525 |
| 35 | 175 |
| 36 | 0 |
| 37 | 0 |
| 38 | 10 |
| 39 | -120 |
| 40 | 615 |
| 41 | -1624 |
| 42 | 2310 |
| 43 | -1680 |
| 44 | 490 |
| 45 | 0 |
| 46 | 1 |
| 47 | -24 |
| 48 | 276 |
| 49 | -1624 |
| 50 | 5376 |
| 51 | -10416 |
| 52 | 11704 |
| 53 | -7056 |
| 54 | 1764 |
| 55 | 0 |
| 56 | 0 |
| 57 | 15 |
| 58 | -280 |