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 | -3 |
| 9 | 1 |
| 10 | 0 |
| 11 | 1 |
| 12 | 6 |
| 13 | -6 |
| 14 | 1 |
| 15 | 0 |
| 16 | -15 |
| 17 | 10 |
| 18 | 20 |
| 19 | -10 |
| 20 | 1 |
| 21 | 0 |
| 22 | 48 |
| 23 | -225 |
| 24 | 50 |
| 25 | 50 |
| 26 | -15 |
| 27 | 1 |
| 28 | 0 |
| 29 | 581 |
| 30 | 1008 |
| 31 | -1575 |
| 32 | 175 |
| 33 | 105 |
| 34 | -21 |
| 35 | 1 |
| 36 | 0 |
| 37 | -11069 |
| 38 | 16268 |
| 39 | 9408 |
| 40 | -7350 |
| 41 | 490 |
| 42 | 196 |
| 43 | -28 |
| 44 | 1 |
| 45 | 0 |
| 46 | 20784 |
| 47 | -398484 |
| 48 | 195216 |
| 49 | 56448 |
| 50 | -26460 |
| 51 | 1176 |
| 52 | 336 |
| 53 | -36 |
| 54 | 1 |