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 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -1 |
| 9 | 1 |
| 10 | 0 |
| 11 | -3 |
| 12 | 11 |
| 13 | -3 |
| 14 | 1 |
| 15 | 0 |
| 16 | 12 |
| 17 | -50 |
| 18 | 35 |
| 19 | -2 |
| 20 | 1 |
| 21 | 0 |
| 22 | -60 |
| 23 | 274 |
| 24 | -225 |
| 25 | 17 |
| 26 | -5 |
| 27 | 1 |
| 28 | 0 |
| 29 | 360 |
| 30 | -588 |
| 31 | 406 |
| 32 | -147 |
| 33 | 175 |
| 34 | -3 |
| 35 | 1 |
| 36 | 0 |
| 37 | -2520 |
| 38 | 4356 |
| 39 | -3283 |
| 40 | 6769 |
| 41 | -980 |
| 42 | 46 |
| 43 | -7 |
| 44 | 1 |
| 45 | 0 |
| 46 | 20160 |
| 47 | -36528 |
| 48 | 29531 |
| 49 | -67284 |
| 50 | 7483 |
| 51 | -648 |
| 52 | 273 |
| 53 | -4 |
| 54 | 1 |
| 55 | 0 |